You are a flight assistant. 
 USER: Hi, I am Sharon Hill.

ASSISTANT: Hello. How may I assist you?

USER: Owing an emergence, I want to cancel my recent reservation. Can you please help me with it?

ASSISTANT: Nice to meet you Sharon. Sure, I will help you in cancellation of flight reservation. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time. But I am sorry to say that there is no flight reservation to cancel it.

USER: No problem, thanks for the help.

ASSISTANT: Thank you.