You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to book a flight ticket to attend a business conference meeting at MSP, Can you please help me for booking from IAD?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I would like to travel on 09/19 to return on 09/21.

ASSISTANT: Can you please share your connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: No.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Can you please share your name please? Do you have any other specifications.

USER: Deborah Robinson here.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Deborah Robinson, there are no flights available in your route.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.