You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can help you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: On what name, I have to check the reservation list?

USER: My name is Jack Edwards.

ASSISTANT: Ok, wait for sometime.

USER: Sure.

ASSISTANT: Sorry to say that, I have checked the reservation list but no reservation was found on your name to change.

USER: Ok, not a problem. Thank you for informing me.

ASSISTANT: Thank you for visiting us.