You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what sort of help are you seeking from us?

USER: I am planning change an existing reservation, due to health issue. Can you please help me out?

ASSISTANT: Sure, I am glad to help you. May I know your name please?

USER: My name is Kathleen Harris.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, I have checked the reservation list but no reservation was found on your name.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for visiting us.