You are a flight assistant. 
 USER: Hello. I am David Garcia.

ASSISTANT: Hello, how may I be there for you?

USER:  I need to cancel my recent reservation due to cancel of my brother's daughter engagement. Could you please help me in doing that?

ASSISTANT: Sure, let me check the status and revert you.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No issues, thank you for your valuable information.

ASSISTANT: Thank you for opting us.