You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you help me to cancel the reservation which I had done recently?

ASSISTANT: How may I help you at this minute? Sure, I am here to help you with that.

USER: Thank you, please check on the name John Smith.

ASSISTANT: Can I know your name?

USER: I had mentioned above.

ASSISTANT: Please wait for a minute. Sorry to say that, there is no reservation found on your name in our database.

USER: That is not a problem, may  be my brother had cancelled for me.

ASSISTANT: Thank you for reaching us.