You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Betty Green. Planning to go to my home, as it is time for vacation. So, please book a flight to PHL. Price limit I can afford is 200.

ASSISTANT: Sure, may I know your journey dates?

USER: My vacation starts on 04/29. And my plan to return is 05/01.

ASSISTANT: To proceed booking I need your source code.

USER: I would like to start from ATL.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: There is a flight with airline: UA and flight number:1029 with price 200. Shall I proceed?

USER: Ok, I am ready to travel with that flight.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for confirming my ticket.

ASSISTANT: Thank you have a nice vacation.