You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Kenneth Scott.

ASSISTANT: Good to know you, Scott.

USER: I want to change my existing reservation because of my health problem.

ASSISTANT: Oh! ok, let me check your existing reservation details.

USER: Ok, please check.

ASSISTANT: Are you sure, did you book the ticket on your name only?

USER: Yes, I have booked on my name.

ASSISTANT: But there is no reservation found on your name, Scott.

USER: That's ok. Thank you for checking.

ASSISTANT: Thank you so much for reaching us, have a nice day.