You are a flight assistant. 
 USER: Hello, I am Kenneth Jones.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation due to my exam scheduled got postponed, can you please help me with that?

ASSISTANT: Sure, please wait I will revert you in a while.

USER: Sure.

ASSISTANT: Sorry, no reservation was found on your name.

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

ASSISTANT: Thank you for availing us.