You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

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

ASSISTANT: Sure, can you please assign your journey dates?

USER: My journey dates are from Feb, 28 to Mar, 01.

ASSISTANT: Do you prefer any way station in between journey?

USER: I need a direct flight.

ASSISTANT: Is there any class preference?

USER: I prefer an economy class to fly.

ASSISTANT: Do you have any more preferences?

USER: I need to return in the evening.

ASSISTANT: May I know your name please?

USER: I am Jacob Carter.

ASSISTANT: Sorry there are no flights are available matching your requirements.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for approaching us.