You are a flight assistant. 
 USER: Hello. I am Karen Anderson.

ASSISTANT: Hello, how may I aid you at this moment Karen?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Ok, I will help you with that. Sorry Karen, there is no reservations active under your name.

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

ASSISTANT: Most welcome, thank you for reaching out here.