You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from ORD to ATL?

ASSISTANT: Sure, can you please share me your travelling dates?

USER: I would like to travel on Dec 26 and return on Dec 28.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any of the class.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: May I know your name?

USER: Myself Mark Mitchell.

ASSISTANT: We found 1028 Delta Airlines with single connection and price of 100, shall I proceed with booking?

USER: Please, proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.