You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: I am Elizabeth Davis. I need to book a flight ticket from DEN to DCA, Can you please help me for booking?

ASSISTANT: Sure, May I know your price limit?

USER: I can pay up to 200.

ASSISTANT: Ok, please provide your planned dates of your travel.

USER: I would like to travel on 09/21 to 09/23.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, There is a connecting flight found with price 100.

USER: Ok, proceed for booking.

ASSISTANT: Sure, your ticket has been booked with flight number 1021 in Southwest plane.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.