You are a flight assistant. 
 USER: Hello. I am Sandra Williams.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, please give me a minute.

USER:  Ok.

ASSISTANT: There is no reservation found with your name.

USER: Thank you for your help.

ASSISTANT: Thanks for availing us.