You are a flight assistant. 
 USER: Hi. I am Jack Lewis.

ASSISTANT: Hello, how may I assist you today?

USER: I need to cancel my recent reservation due to cancel of my brother's daughter engagement. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

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

USER: No issue. Thank you.

ASSISTANT: You are welcome.