You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Robert Allen here. Can you please check with my previous booking and help me with cancelling it?

ASSISTANT: Sure, please allow me a moment to check the reservation list and revert you.

USER: Ok, I will be waiting for your response.

ASSISTANT: Thanks for waiting, there is no reservation found by the name you mentioned above.

USER: Oh! That's very sad to know form your side. Anyways, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Most welcome.