You are a flight assistant. 
 USER: Hello,. I am Anna Nelson.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Ok.

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

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

ASSISTANT:  Thank you for opting us.