You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me to cancel my recent reservation, because of some personal problem I cancelled my vacation?

ASSISTANT: Oh! That's sad to hear. May I know your name please?

USER: Please check with the name of Larry Carter.

ASSISTANT: Sure, I will check in our records and inform you whether your ticket is refundable or not.

USER: Ok. Take your own time.

ASSISTANT: Sorry, I checked in my database. I didn't find any reservation under your respected name.

USER: It's not a problem, I think that reservation has been cancelled by my brother. Thanks for your help and genuine service.

ASSISTANT: You are welcome.