You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to some health issues. Can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Myself Scott Martin.

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

USER: Ok, not a problem. Thanks for your assistance.

ASSISTANT: Thank you for choosing us.