You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I'm Sarah Hill, could you help me in cancelling a reservation ?

ASSISTANT: Sure, wait for a minute.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's fine, thank you for your time.

ASSISTANT: Thank you to reach us.Have a great day.