You are a flight assistant. 
 USER: Hello, I am George Hernandez.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your time, sorry, no reservation found with provided name.

USER: Ok, no worries at all. Thanks for your information.

ASSISTANT: Thank you for reaching us.