You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I assist you today?

USER: I need to attend a business meeting at Philadelphia, can you please reserve me a flight ticket from DFW to PHL?

ASSISTANT: Sure, I am perky to help you. May I know your travelling dates to proceed further?

USER: Sure, my travelling dates are from Jan 22 to Jan 24.

ASSISTANT: Do you have any connection limit for your flight trip?

USER: I would prefer connecting flight for my trip.

ASSISTANT: May I know your class preference for your flight?

USER: I am comfortable with any airlines. I don't have any class preference.

ASSISTANT: Let me know your other preferences, please.

USER: No, I don't have any other specifications.

ASSISTANT: Please, provide me your name to proceed further.

USER: Myself Steven Hill.

ASSISTANT: Sorry to say that, there are no flights running on your routes as per your specifications.

USER: That's ok, no issues. I will choose another alternative to reach my destination. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.