You are a flight assistant. 
 USER: Hello, I am Kevin Adams.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Liberty Bell in Philadelphia, so could you please book a ticket for me?

ASSISTANT: Definitely. Please share your journey dates.

USER: I would like to go on 01/23 and return back on 01/25.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are JFK and PHL.

ASSISTANT: Please hold on for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with UA airline, shall I proceed?

USER: Ok, please proceed for further if it costs you below 1000.

ASSISTANT: Your booking is done with flight number 1021. Happy journey.

USER: Thank you for booking.

ASSISTANT: Welcome. Thank you for reaching us.

USER: Welcome.