You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you today?

USER: My name is Pamela Martin, I want to change my existing reservation due to health issues.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: No problem, thank you for your help.

ASSISTANT: Thanks for opting us.