You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you now?

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

ASSISTANT: Sure, I am her to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name to check your reservation status?

USER: Myself Jack Smith.

ASSISTANT: Ok, please wait.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database.

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

ASSISTANT: Thanks for choosing us.