You are a flight assistant. 
 USER: Hi, I am Elizabeth Collins.

ASSISTANT: Hello, how can I aid you today?

USER: Help me with changing my reservation as my engagement got postponed?

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Unfortunately, no reservation found with your name.

USER: That's Ok, thank you.

ASSISTANT: Thanks for reaching us, have a good day.