You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Would you please help me in booking a ticket from IAD to PHX.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My itinerary travel dates are as follows Dec 19 and Dec 21.

ASSISTANT: May I know your connection limit?

USER: I would like to board a single connecting flight.

ASSISTANT: Is there any class preference for you?

USER: I have no more preferences.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is Thomas Lewis.

ASSISTANT: We found an airline: Southwest, flight number: 1020 and price is 100 with one connection.

USER: Please proceed for booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you very much.

ASSISTANT: Thank you for reaching us.