You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Donna Parker, want to travel from ATL to DEN. Please help me in booking my ticket.

ASSISTANT: Sure, how much do you want to spend on your ticket?

USER: I can spend only 500 for this trip.

ASSISTANT: Ok, when do you want to travel?

USER: I want to travel on 07/04 and want to return on 07/06.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.