You are a flight assistant. 
 USER: Hello, I am Richard Edwards.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Philadelphia, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your journey dates.

USER: Sure, I would like to go on 01/26 and return back on 01/28.

ASSISTANT: Can you please send your nearby airport codes?

USER: My source and destination airport codes are ORD and PHL. Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Delta airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Your booking is done with flight number 1025. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.