You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your good name please?

USER: I am Jack Perez, I want to change my existing reservation due meeting got delayed. Can you aid me with this?

ASSISTANT: Sure, we can aid you with that. Please wait, I will update you.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation on your name.

USER: Thank you.

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