You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I wanted to cancel my reservation due to my planned programme got postponed. Can you help me is there any chance to cancel my reservation?

ASSISTANT: Sure, I will help you with that. May I know your good name for checking existing details?

USER: I am Lisa Hernandez.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Ok Lisa, your ticket has found and cancelled successfully.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us. Please visit again.

USER: Sure.