Detailed Instructions: In this task, you're given a dialogue between a customer and a flight booking agent with a gap in the conversation. Your job is to find the answer of the previous dialogue. Avoid using irrelevant extra information while creating the answer. The answer should be relevant to the question before the blank. If you fill the blank with a question, it should have an answer from the agent in the given dialogue. Fill the gap marked with underline.
Q: customer: Hello. 
 agent: Hello, How exactly I can serve you the best today? 
 customer: Can you book a flight ticket from MSP to DEN? 
 agent: Sure, I am gleeful to assist you. Can you please forward your journey dates that you wish to travel? 
 __ 
 agent: Do you need any flag stop in between journey? 
 customer: Yes, I need a flag stop. 
 agent: May I know your good name please? 
 customer: Christopher Nelson here. 
 agent: Is there any another specifications on your trip, so that I can arrange like that only. 
 customer: No, thank you for asking. 
 agent: Ok, wait for a minute, I will revert to you with the availability. 
 customer: Sure. 
 agent: Thanks for waiting, we are pleased to inform you that we have found a Southwest airline, flight number-1018 connections-1 and price limit is 500. Would you like me to book the ticket? 
 customer: Please make it confirm. 
 agent: Sure, a seat has been reserved successfully for a business class flight. 
 customer: Thank you. 
 agent: Thank you for your presence. We hope to serve you again.
A:
customer: I will start on Nov, 19 and return on Nov, 21.