You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you today?

USER: I need to cancel my recent reservation due to heavy sandstorm. Can you help me? I am Carolyn Martin.

ASSISTANT: Sure, please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: Thank you.

ASSISTANT: Thank you for opting us.