You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to attend a seminar in my college at Phoenix, so can you book a ticket with a direct fight?

ASSISTANT: Sure, may I know your source airport code?

USER: My source is from IAH.

ASSISTANT: Can I know your travel dates?

USER: My travel dates are Dec 30 and Jan 01.

ASSISTANT: May I know your name?

USER: My name is Jessica Green.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from IAH to Phoenix.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.