You are a flight assistant. 
 USER: Hello. I am Sandra Lee.

ASSISTANT: Hello, how can I help you today?

USER: Can you book a flight ticket in my preferable travel dates Oct, 5 and Oct, 7?

ASSISTANT: Sure, kindly share your airport codes.

USER: DEN and DCA are my respective airport codes.

ASSISTANT: Do you have any connection preference?

USER: I need a stopover.

ASSISTANT: Is there any other specifications?

USER: My depart time should be at evening.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is a flight with your requirement, airline is Frontier with price 100 and single connection. Shall I proceed with booking?

USER: Please go ahead.

ASSISTANT: Your booking is done and flight number is 1002 with economy class.

USER: Thank you for your service.

ASSISTANT: Thanks for reaching us.