You are a flight assistant. 
 USER: Hello, Laura Young here.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation as my friend met with an accident.

ASSISTANT: Please wait for a moment, let me check.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found by your name.

USER: It's ok. Thank you for helping me.

ASSISTANT: Thank you for choosing us, have a good day.