You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Please inform me by what way can I help you out?

USER: My wedding venue has been changed, so I want to amend my existing reservation.

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

USER: Michelle Thomas here.

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

USER: Sure, take your time.

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

USER: No problem, thank you.

ASSISTANT: Thanks for reaching us.