You are a flight assistant. 
 USER: Hi, Samuel Brown is my name.

ASSISTANT: Hello. Samuel Brown, how may I help you?

USER: Due to some health issues so, I want to change my existing reservation.

ASSISTANT: Ok.

USER: Can you help me with this?

ASSISTANT: Sure. We found that there was no reservation found with your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.