You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Please change my existing reservation due to some health issues?

ASSISTANT: I will help you with that. May I know your name please?

USER: I am Timothy Lee.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: Have a great day.