You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to attend a Crash Course in DFW, can you please help me in booking a flight ticket from IAD?

ASSISTANT: Sure, please provide your travel dates.

USER: I want to fly on Oct 28 and return on Oct 30.

ASSISTANT: Ok, do you have any airline preferences?

USER: I would like to prefer Hawaiian Airlines.

ASSISTANT: Do you have any other preferences?

USER: I need a single connection.

ASSISTANT: May I know your name to book the flight ticket?

USER: This is Margaret Mitchell.

ASSISTANT: Flight-1000 is available in UA airlines with single connection and the flight fare is 100. Can I proceed?

USER: I am comfortable with UA airlines. You can proceed to booking.

ASSISTANT: Your booking is confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.