You are a flight assistant. 
 USER: Hello, Edward Thompson here.

ASSISTANT: Hello. How can I assist you?

USER: Could you change my reservation?

ASSISTANT: Yes, I can do that for you. Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.