You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please help me to book a flight ticket from CLT to PHL.

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: My trip dates are from Apr, 28 to Apr, 30.

ASSISTANT: Do you need any way station in your journey?

USER: I need a direct flight.

ASSISTANT: Is there any class preference for you?

USER: I prefer an economy class.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Scott Robinson.

ASSISTANT: Sorry to inform you that, there are no flights available with your specifications.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.