You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I need to cancel my reservation because my friends have already booked my ticket in another flight I was not aware of this thing, so can you please help me out with cancelling of my reservation?

ASSISTANT: Sure, I am gleeful to help you.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your previous reservation?

USER: Sure, my name is Sarah Williams.

ASSISTANT: Please wait a moment to check.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation with your name in our records.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thank you for approaching us, have a great day.