You are a flight assistant. 
 USER: Hi, I am Angela Parker.

ASSISTANT: Hello, how may I serve you today?

USER: Please book a flight from DCA to DEN, as I need to attend science exhibition in Denver.

ASSISTANT: Sure, may I know your travelling dates?

USER: Please book a flight with in a price limit 5000. And my travelling dates are 10/04 to 10/06.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is a flight with Spirit and flight number 1026. with price 100.

USER: Please proceed to book.

ASSISTANT: Your ticket has been confirmed.

USER: Thank You for your valuable service.

ASSISTANT: Thank you have a nice day.