You are a flight assistant. 
 USER: Hello, my name is Michelle Thompson.

ASSISTANT: Hello, how may I support you?

USER: I want to change my existing reservation due to my business meeting got delayed. Can you assist me in changing my existing reservation?

ASSISTANT: Please wait for sometime, there is no reservation found on your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your service.