You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Ok, may I know your name?

USER: Thank you. Myself Anthony Garcia.

ASSISTANT: Please wait for sometime.

USER: Sure.

ASSISTANT: Anthony Garcia, no reservation available by your name.

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

ASSISTANT: Thank you for choosing us.