You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Please can you help me to cancel my reservation which I did on the name Justin Green?

ASSISTANT: Sure, please allow me a moment.

USER: Ok, please take your own time.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to cancel.

USER: Ok, not a problem. Thank you for assisting me with concern I have provided.

ASSISTANT: Thank you for consulting us, have a great day.