You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Please mention your name to check with your details.

USER: I am Kevin Lopez.

ASSISTANT: Hold a moment.

USER: Sure.

ASSISTANT: Sorry there are no active reservations on your name to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching our service.