You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Jacob Phillips here. I would like to change my recent reservation due to some work postpone. Can you help me to change this reservation?

ASSISTANT: Sure, give me a minute. Sorry, there is no reservation found under your name.

USER: Ok, take your own time. It's ok, thanks for your information.

ASSISTANT: Thank you for opting us.