You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Gregory Thomas here. Due to my health issues I have cancelled my reservation which is done last week. So, please help me out to cancel my reservation.

ASSISTANT: Ok, sure I can help you with in your cancellation. Can you please wait for a while.

USER: Ok, sure. Please revert back me with my reservation details.

ASSISTANT: Sorry Thomas, no flight ticket is reserved under your name in my database. Do you have any other quires to solve?

USER: No, I do not have any requirements. Oh! it might be reserved with another service by my brother. Anyway thank you for your assistance.

ASSISTANT: Most welcome.