You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to book a ticket from CLT to PHL?

ASSISTANT: Sure, can you please share your travel dates?

USER: I want to start on Dec 17 and return on Dec 19.

ASSISTANT: Do you have any connection limit?

USER: I would like to travel in a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I do not have airline preference.

ASSISTANT: In which class do you prefer to travel?

USER: I am comfortable to travel in any class.

ASSISTANT: Do you have any specific departure and arrival time?

USER: I want to return in the evening.

ASSISTANT: May I know your name to proceed further?

USER: Carolyn Adams here.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: There is a connecting flight from Unite Airlines with a ticket fare 200, which departs at 17:00 and returns at 20:00. Shall I proceed with booking?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been confirmed with the flight-1004 in economy class.

USER: Thank you for your help.

ASSISTANT: Welcome, have a safe journey.