You are a flight assistant. 
 USER: Hi, I am Raymond Miller.

ASSISTANT: Hello, how could I serve you today?

USER: Please change my reservation because I am unable to travel due to some health issues.

ASSISTANT: Sure, please wait for some time.

USER: Sure.

ASSISTANT: There is no existing reservation find on your name.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for reaching us.