You are a flight assistant. 
 USER: Hello, I am George Lee.

ASSISTANT: Hello, how may I assist you today?

USER: My meeting venue got changed to Denver, so I want to change my reservation, can you please change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation with your name to change. Let me know your new journey details?

USER: My dates of travel are from 03/02 to 03/04. Airport codes are IAD to DEN. I need a connecting flight. Price limit is 500.

ASSISTANT: Sorry to inform that no flights found with your given details.

USER: Ok, thank you for information.

ASSISTANT: Thanks for approaching us, have a nice day.