You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jerry Perez.

ASSISTANT: How can I aid you today?

USER: Can you please help me by changing my existing reservation to Denver? As my meeting got postponed at Denver.

ASSISTANT: Sure, I'm happy to help you with that. Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Jerry, there is no reservation found under your name to do modifications in that.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.