You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Clark.

ASSISTANT: How could I support you today?

USER: I want to travel from OAK to DEN. Can you book a flight ticket for me?

ASSISTANT: To book a ticket, may I know your budget for plane ticket?

USER: My budget for ticket is 1000.

ASSISTANT: Can you please let me know your travelling dates?

USER: I want to travel on 09/01 and 09/03.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: We found a flight with an airline Spirit of flight 1026 and cost is 100 which matches your given details. Can I proceed with the booking?

USER: Proceed to booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for helping me out.

ASSISTANT: Thank you for choosing us.