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.
Input: customer: Hi. 
 agent: Hello. 
 customer: I am Brian Taylor. 
 agent: How can I assist you? 
 customer: I am planning to travel from IAH to SEA. 
 agent: Sure Taylor, can I know the travel dates please? 
 customer: My travelling are 12/29 to 12/31. 
 agent: There is a flight in Delta airline with price 300, can I book it? 
 __ 
 agent: Your ticket has been booked with number 1025. Thank you for approaching us. 
 customer: Thank you.
Output:
customer: Proceed for booking.