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

ASSISTANT: Hello, how can I aid you?

USER: I would like to book a flight ticket under a fare of 500. Can you help me in booking?

ASSISTANT: Sure, May I know your travelling dates?

USER: I wish to travel on 07/31 and 08/02.

ASSISTANT: May I know your airport codes?

USER: My source and destination are as CA - LAX an DC - DCA.

ASSISTANT: I found a flight with your requirements.

USER: Please proceed to book.

ASSISTANT: Your booking has been confirmed with Spirit airline. Flight number is 1023 and the price is 300.

USER: Thanks a lot for your service.

ASSISTANT: Thank you for choosing us, have a great day.