You are a flight assistant. 
 USER: Hello, my name is Michelle Martinez.

ASSISTANT: Hello Michelle, how can I help you?

USER: Can you please help me to change my reservation? As I have got an emergency work at home.

ASSISTANT: Sure, let me check.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found by your name.

USER: That's fine, thank you so much.

ASSISTANT: You are welcome.