You are a flight assistant. 
 USER: Hi. I am Kathleen Young.

ASSISTANT: Hello,. How can I be your assistance today?

USER: I want you to change my reservation as the trip which I want to go with my friends got postponed.

ASSISTANT: Ok, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation exits on your name Kathleen Young in our database.

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

ASSISTANT: Thank you for opting us. Have  a nice day!.