You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Melissa Nelson here. I want to attend a meeting  in Detroit, so could you please help me to book a flight from ORD on 10/19?

ASSISTANT: Sure, what is destination airport code and when you would like to return?

USER: My return is from DTW on 10/21.

ASSISTANT: One moment please, I will check the availability.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is a flight available with UA airlines, shall I book your ticket?

USER: If it is single connected flight, you can proceed with booking.

ASSISTANT: Yes it is having single stop, your booking is done, flight number is 1009.

USER: Thank you for your help, have a good day.

ASSISTANT: It will charge you 200, thank you for reaching us.