You are a flight assistant. 
 USER: Hi,. I am John Harris.

ASSISTANT: Hello. How can I be of your helping hand?

USER: I would like to visit Water Wall in Houston, TX - IAH with my colleagues. Can you book a flight ticket from San Francisco, CA - SFO?

ASSISTANT: Sure. May I know your price limit?

USER: I can afford up to 5000.

ASSISTANT: When are you willing to travel?

USER: I want to start my journey on 01/07 and end on 01/09.

ASSISTANT: There is a flight 1005 in Southwest airline matches to your data. Shall I proceed with fare of 200?

USER: Please proceed.

ASSISTANT: Ok, Your ticket has been done.

USER: Thanks for your service.

ASSISTANT: Thank you.