You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to change the reservation which I had done last week?

ASSISTANT: Sure, I can cancel your reservation right now. Before that I need to know your good name please?

USER: Ok, thank you. My name is Stephen White.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Yes, I will wait.

ASSISTANT: Thanks for remaining so positive. We are sorry to say that, there is no active reservation found on your name.

USER: That is ok, thank you for providing the information.

ASSISTANT: Thanks for reaching us.