You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: Sure, I am Kathleen Walker.

ASSISTANT: Ok, How can I help you today?

USER: I want to change my reservation, due to some personal work.

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found under your name to do modifications in that.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for availing us.