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, I am William Collins. 
 agent: Hello, how may I serve you today? 
 customer: Me and my friend's were planning to visit rockridge ice cream & gelato tour which is in Oakland. Can you please assist me in booking a flight ticket with fare 500? 
 agent: Sure, we are mirthful to help you. Can you please let me know your journey dates? 
 customer: My departure date is 08/17 and arrival date is 08/19. 
 agent: Kindly assign your source and destination points? 
 customer: My source code is TX-AUS and destination code is CA-OAK. 
 agent: Please wait for a while. 
 __ 
 agent: Sorry we did not find any flights matching your criteria. 
 customer: Ok, no worries at all. Thank you. 
 agent: Thank you for reaching us. Have a good day.
Output:
customer: Sure.