You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Smith.

ASSISTANT: How can I aid you today?

USER: Could you please help me to cancel my recent reservation as my plan to meet my grand parents got postpone?

ASSISTANT: Sure, I am mirthful to help you with that reservation cancel. Please hold for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no active reservation found with your name in our reservation list to cancel it.

USER: No problem, thanks for checking.

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