You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I am Kenneth Adams. I want to change my existing reservation due to postpone of my exams, can you help me with this?

ASSISTANT: Sure, let me check the current status and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting. We could not find any reservation by the name you provided above.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.