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.
Problem:customer: Hi. 
 agent: Hello. How can I hand helping to you? 
 customer: I am Jeffrey Collins want to attend a workshop at Denver, can you book a ticket from OAK to DEN? 
 __ 
 customer: Sure, my travelling dates will be 09/21 and 09/23. 
 agent: I found a 1 lay by in your journey in AA airlines, can I proceed with booking? 
 customer: Yes, proceed with my booking. 
 agent: Ok, the ticket booking is done in 1008 flight number. 
 customer: Thank you. 
 agent: Most welcome.
Solution:
agent: Sure, can you please provide me the dates of your trip?