You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may serve you?

USER: Can you please help me in cancelling my recent reservation?

ASSISTANT: Sure, I will help you. Please provide the name on which ticket is been booked.

USER: Myself Sandra Williams.

ASSISTANT: Sorry Sandra Williams, there is no ticket existing on your name.

USER: Ok, thanks for checking.

ASSISTANT: You are welcome, have a nice day.