You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

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

ASSISTANT: Sure, May I know your name?

USER: My name is Catherine Edwards.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.