You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am John Clark. I want to celebrate my birthday in Denver, can you help me in booking a flight ticket within a price limit of 500?

ASSISTANT: Could you provide me your travel dates?

USER: My departure day is 03/03, return day is 03/05.

ASSISTANT: May I know your travelling points?

USER: My source and destination airport codes are DC - DCA, CO - DEN.

ASSISTANT:  Do you have any preference?

USER: Connection limit is one.

ASSISTANT:  We found a connecting flight UA with flight number 1005 and fare is 100.

USER: You can proceed to booking.

ASSISTANT:  Your booking is confirmed.

USER: Thank you.

ASSISTANT:  Thank you for availing us.