You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my reservation due to my health problem, can you help me with that?

ASSISTANT: Sure, I am glad to help you out.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation status.

USER: I am Pamela Perez.

ASSISTANT: Ok, please be on hold.

USER: Ok.

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

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for reaching us.