You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Helen Edwards, want to alter my recent reservation due to some personal issue. Please help me out with that.

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thanks for waiting, we are sorry to inform you that, there is no active reservation on your name to alter it.

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

ASSISTANT: Thank you for choosing us.