You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: May I know your trip dates?

USER: My travel dates are Apr 18 and Apr 20.

ASSISTANT: Do you prefer any connections?

USER: I need a single connection flight.

ASSISTANT: May I know your specifications?

USER: I don't have any other specifications.

ASSISTANT: Spirit airlines is providing a connecting flight in economy class.

USER: Please proceed for booking.

ASSISTANT: May I know your name?

USER: Katherine Thompson.

ASSISTANT: Thank you. Your booking is done.

USER: Thank you for the help.

ASSISTANT: Thank you.