customer: Hello. 
 agent: Hello, How can I serve you? 
 customer: I am Mark Phillips. I want to visit the National Mall in Washington, so please book a flight ticket for me. 
 agent: Sure, I am glad to help you, Please provide your planned travelling dates? 
 customer: My price limit is 500. 
 agent: Ok. 
 customer: My departure day is 10/20, return day is 10/22. 
 agent: Ok, Can you tell me your airport abbreviates? 
 customer: My source and destinations are MA-BOS, DC-IAD. 
 agent: Ok, Wait a minute. I will check and get back to you. 
 customer: Sure. 
 agent: Thank you for waiting, There is a 1021 Jet Blue airline with 1 connection and price 100. Can I proceed with booking? 
 customer: Ok, you can proceed to booking. 
 __ 
 customer: Thanks for your help.
agent: Your booking has been confirmed. Thank you for choosing us, Have a great day.