You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Moore.

ASSISTANT: By what way, can I aid you now?

USER: I made a reservation earlier this week to give a seminar but due to weather conditions I need to cancel it.

ASSISTANT: Ok. Wait a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation on your name.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for opting us.