You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, we can help you in cancelling. Can I have your name to check your details?

USER: Alexander Nelson here.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: I regret, there is no reservation found.

USER: No problem, Thank you.

ASSISTANT: Thank you for choosing us.