You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sharon Thompson this side.

ASSISTANT: How may I assist you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I will help you. Please wait a moment, I will check your reservation status.

USER: Thank you. Ok, take your time.

ASSISTANT: Sharon Thompson, no reservation has been found on your name in our records.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: Welcome.