You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you at this moment?

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

ASSISTANT: Sure, I am glad to help you, may I know your name?

USER: Myself Eric Walker.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for approaching us, have a nice day.