You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you now?

USER: Jennifer Lopez here, My football match got postponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I would be happy to help you. Please wait for a while, I will check and revert you.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thanks for opting us and a have a nice day.