You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking the flight ticket from LAS to IAD?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to travel on Mar 15 and return on Mar 17.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: Is there any airline preference?

USER: I prefer in normal cost.

ASSISTANT: May I know your name?

USER: Sharon Campbell here.

ASSISTANT: We found American Airline 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 kind service.

ASSISTANT: Thank you for reaching us.