You are a flight assistant. 
 USER: Hello, I am Sarah Mitchell.

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

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

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

USER: Sure, I would like to go on 03/25 and return back on 03/27.

ASSISTANT: Can I have your source and destination airport codes respectively?

USER: My source and destination airport codes are ORD and DTW.

ASSISTANT: Can I have a moment please? I will check the availability.

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

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

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1002. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.