You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there at your service?

USER: I want to book a ticket from IAD to MSP to attend seminar, can you help me in booking?

ASSISTANT: Sure, on what dates are you willing to make your trip?

USER: I am departing on Dec 04 and return on Dec 06.

ASSISTANT: How many connections are required?

USER: I prefer to travel in connecting flight.

ASSISTANT: Is there any class preference?

USER: I am ok with any class.

ASSISTANT: Do you need a major cost airline or low cost airline?

USER: I do not have any airline preference.

ASSISTANT: Ok, may I know your name?

USER: My name is John Wright.

ASSISTANT: American airline is providing a flight 1023 on your way with 1 connection and fare 200. Is that fine?

USER: Please proceed for booking.

ASSISTANT: Your ticket has been booked in economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.