You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at Denver, DEN. Can you help me to book a ticket?

ASSISTANT: Sure, may I know your boarding point?

USER: My airport codes are SEA-DEN.

ASSISTANT: Ok, how much you can spend for a flight ticket?

USER: Price should not cross 1000.

ASSISTANT: Could you please provide me your travelling dates?

USER: Dates are 09/15 and 09/17.

ASSISTANT: May I know your name please?

USER: Donald Jackson here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a Delta airline, flight number: 1004, price: 100 with one connection. Shall I proceed to booking?

USER: Please carry on.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you so much.

ASSISTANT: Thank you, have a good day.