You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jennifer Lewis here.

ASSISTANT: How can I help you?

USER: I am looking for a single connecting flight ticket to Washington for my business trip. So can you book it?

ASSISTANT: May I know your airport codes please?

USER: The airport codes are from DEN to DCA.

ASSISTANT: Your travelling dates please?

USER: Yes, my travel dates are from 3 Dec to 5 Dec.

ASSISTANT: Here is a connecting flight with flight number 1000 and fare is 100, providing ticket in economy class. Shall I proceed with booking?

USER: I am fine with the fare and airlines. You can book it.

ASSISTANT: Your booking is done in Spirit airlines.

USER: Thank you.

ASSISTANT: Thank you for choosing us.