You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be your helping hand today?

USER: Can you please book a flight ticket from DFW To PHL?

ASSISTANT: Sure, on which dates would you like me to book a flight ticket?

USER: I would like to travel on dates Apr 01 and Apr 03.

ASSISTANT: Ok, do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, may I know your connection limit?

USER: Yes, I need a connection in between the journey.

ASSISTANT: At what time would like to depart and arrive?

USER: I don't have particular timings to travel.

ASSISTANT: Ok, may I know your good name please?

USER: My name is Nancy Hall.

ASSISTANT: There are no flights available on your requested dates.

USER: Ok, no problem. Thank you for the response.

ASSISTANT: Thank you for reaching us.