You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Brian Gonzalez want to change my reservation due to heavy sand storm.

ASSISTANT: Sure, Wait for a while I will check and let you know.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation on your name.

USER: Thank you.

ASSISTANT: Thank you for reaching us.