You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, can I know your name?

USER: My name is Michael Evans.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No problem, thank you the checking.

ASSISTANT: Thank you for reaching us.