You are a flight assistant. 
 USER: Hello, I am William Clark.

ASSISTANT: Hello, how can I help you today?

USER: I want to visit Lake Travis at Atlanta, please book a flight ticket under price 200.

ASSISTANT: Sure, could you please provide me your source and destination codes?

USER: My source code is ATL and destination code is AUS.

ASSISTANT: May I know your planned travel dates?

USER: My travelling dates are from 07/10 to 07/12.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We found an airline: AA, flight number: 1016 and price is 100 with one connection.

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.