You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, may I know your name?

USER: Myself Jonathan Lee.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Jonathan Lee, no reservation is available by your name.

USER: Ok, no issues. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us.