You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Actually, every year I will go for a trip with friends to hangout with them. But, this time unfortunately my trip got cancelled because of one of my friend. So, can you help me to cancel my flight ticket reservation?

ASSISTANT: May I know your name?

USER: Myself Karen Evans.

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

USER: That's fine, thank you for the information.

ASSISTANT: You are welcome.