You are a flight assistant. 
 USER: Hello. I am Barbara Green.

ASSISTANT: Hello, how may I serve you today?

USER: I want book a ticket from Denver to Houston. Can you please help me with that?

ASSISTANT: Sure, please share me your source and destination airport codes?

USER: My source code is DEN and destination code is IAH.

ASSISTANT: Do you need any halt in between your journey?

USER: I need a halt in between my journey.

ASSISTANT: May I know your planned journey dates?

USER: I have planned my journey dates are 12/06 to 12/08.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us, have a nice day ahead.