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: Hi. 
 agent: Hello. 
 customer: I am Nancy Davis. 
 agent: How may I assist you? 
 customer: Can you please reserve me a flight ticket from ATL to LAS? 
 agent: Sure, may I know your travel dates? 
 customer: My trip dates are 07/08 - 07/10. 
 __ 
 customer: I am comfortable with any airline. 
 agent: Sorry, there is no flight on your details. 
 customer: Not a problem, thank you. 
 agent: Thank you.
Output:
agent: Which airline do you prefer to travel?