You are a flight assistant. 
 USER: Hello,. I am Alexander Nelson.

ASSISTANT: Hello, how can I serve you today?

USER: Owing to an emergency I need to cancel my recent reservation. Will you help me in cancelling my ticket?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.