You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Carol Young. I am planning to attend a meeting in PHX. Can you please book a ticket for me?

ASSISTANT: Ok, where you want to start from?

USER: My source airport code is OAK.

ASSISTANT: Ok, when you want to travel?

USER: I would like to travel on 06/16 and return back on 06/18.

ASSISTANT:  Carol Young, there is no flight for you according to your information.

USER: That's fine. Thank you for your help.

ASSISTANT: It's my pleasure. Ok, thanks for choosing us.