You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: I am Charles Edwards.

ASSISTANT: How can I support you, Charles?

USER: I want to change my existing reservation due to my health issue. Can you help me out?

ASSISTANT: Sure, we will help you. Just give me a moment to track your details and I will let you know.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation on your name to modify.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for consulting us.