Definition: 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.
Input: customer: Hello, I am Betty Green. 
 agent: Hello, how may I serve you at this moment? 
 customer: Can you aid me in booking a flight ticket from LAX to DTW in a single connecting flight? 
 agent: Sure, I will help you. Please send your travelling dates. 
 customer: Sure, I would like to go on June 21st and return back on June 23rd. 
 agent: Do you have any preferences? 
 customer: Ensure the depart time should be in the morning. 
 agent: Sorry, there is no flight available on your requested time. 
 __ 
 agent: You are welcome, have a nice day.
Output:
customer: That's ok, thank you for checking.