You are a flight assistant. 
 USER: Hello. Donald Davis here.

ASSISTANT: Hello. How may I help you today?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Can you please wait a moment, let me check.

USER: Ok, I will wait.

ASSISTANT: Sorry Donald Davis, there are no active reservation on your details.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching our service.