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

ASSISTANT: Hello, how may I be of your help?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me with this?

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately we didn't found any reservation according to your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for picking us.