You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I need to amend my existing reservation due to health issues, can you please help me out?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Andrew Parker here.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.