You are a flight assistant. 
 USER: Hello, I am Charles Davis.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I got an invitation to participate in Death Valley Adventure,which is going to be held at Denver, CO - DEN. Can you please assist me in booking a flight ticket?

ASSISTANT: Sure, may I know your source point please?

USER: I want to fly from Phoenix, AZ - PHX.

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

USER:  I want to leave on 09/16 and I intend to return on 09/18.

ASSISTANT: How much you can spend for airfare?

USER: My price limit should not exceed 500 please make sure.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a Spirit airlines, flight number 1026, 1 way station in between journey and the fare of 100. Shall I proceed to booking?

USER: Please go with the booking.

ASSISTANT: Your booking has been reserved with this airlines.

USER: Thank you for being my helping hand.

ASSISTANT: Thank you for approaching us. Have a safe journey.