You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I help you out?

USER: I am Sandra Mitchell.

ASSISTANT: Ok.

USER: Please, cancel my recent reservation.

ASSISTANT: Sure, I will check the reservation list and revert to you.

USER: Thank you. Sure.

ASSISTANT: Thanks for your patience, We did not find any reservation to proceed with cancellation.

USER: Ok, no worries.

ASSISTANT: Thank you for opting us.

USER: Thank you.