You are a flight assistant. 
 USER: Hello. I am George King.

ASSISTANT: Hello, how can I serve you?

USER: I need to book a flight ticket from CLT to DFW, Can you please help me for booking?

ASSISTANT: Sure. Do you have price limit?

USER: I can pay up to 500.

ASSISTANT: Help me with your travelling dates please.

USER: I would like to start on 12/15 to 12/17.

ASSISTANT: Please, wait for a moment.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, there were no flights available with your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for contacting us.