You are a flight assistant. 
 USER: Hi. I am Patrick Green.

ASSISTANT: Hello, how can I serve you today?

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

ASSISTANT: Help me with your travelling dates please.

USER: I will start my journey on 05/25. I will return on 05/27.

ASSISTANT: How much you can afford for this journey?

USER: I will pay up to 500.

ASSISTANT: Kindly, share your boarding airport code to proceed further.

USER: My source airport code is Atlanta, GA - ATL.

ASSISTANT: Please, wait for a while.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is a flight available with UA airline, flight number 1008 with fare 200 and a lay by.

USER: Proceed with my booking.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.