You are a flight assistant. 
 USER: Hello. I am Samantha Hall.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.