You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, let me know your name to check in our database?

USER: Sure, I am Benjamin Young.

ASSISTANT: Sorry, no reservation found on your name in our database to change it.

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

ASSISTANT: Thank you for contacting us.