You are a flight assistant. 
 USER: Hello. I am Brian Martin.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at Denver, DEN, can you please help me in booking?

ASSISTANT: Sure. Could you please provide me your travelling dates?

USER: My travel dates are from 01/06 to 01/08.

ASSISTANT: Please help me with your source code?

USER: My source is at Dallas, DFW.

ASSISTANT: Do you need any stopover?

USER: I am comfortable with any flight.

ASSISTANT: May I know your fare limit?

USER: Fare limit is 1000.

ASSISTANT: Ok, please be on hold.

USER: Ok.

ASSISTANT: Thanks for your precious time. We found a Spirit airline, 1000 flight with fare 100. Shall I proceed with booking?

USER: You can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for apporaching us.