You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I abet you?

USER: I want to change my existing reservation. Can you assist me in this?

ASSISTANT: Sure, may I know your name?

USER: I am Jason Wilson.

ASSISTANT: Please hold on, I will revert to you.

USER: Ok.

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

USER: Not a problem, thank you.

ASSISTANT: Thanks for your approach.