You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patricia Martin.

ASSISTANT: How can I assist you today?

USER: I want to travel from PHL to DFW. Can you book a flight ticket for me?

ASSISTANT: Sure, I am here to help you with that flight ticket booking. May I know your travelling dates, please?

USER: I would like to travel in the flight on Mar 06 and Mar 08.

ASSISTANT: Do you have any airline preference?

USER: No, but I am looking for a direct flight.

ASSISTANT:  Do you have any particular time for departing and returning?

USER: I want to depart in evening time.

ASSISTANT: Do you prefer either business or economy class?

USER: I don't have any preference.

ASSISTANT: There are no flights found on this route as per your details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.