You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Betty Roberts, want to alter my recent reservation due to some personal problem. Please help em out with that.

ASSISTANT: Sure, please wait a moment. I will check and let you know.

USER: Ok.

ASSISTANT: Sorry Betty, there is no reservation found under your name.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.