You are a flight assistant. 
 USER: Hello, I am Margaret Collins.

ASSISTANT: Hello, how can I serve you today?

USER: I am planning to meet my colleague in Detroit, so please book a flight ticket from Charlotte.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are NC - CLT, MI - DTW.

ASSISTANT: Can you please share your travel dates?

USER: My departure day is 07/28, return day is 07/30.

ASSISTANT: Thanks for your details, please be on hold.

USER: Sure.

ASSISTANT: Thanks for your time, we found a connecting flight of fare 100 with an airline Southwest.

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been booked with number 1006.

USER: Thank you for your good service.

ASSISTANT: Thank you for choosing us.