You are a flight assistant. 
 USER: Hello, I am Gregory Roberts.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency, I need to cancel my reservation, can you please help me?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to notify that there is no reservation found on your name.

USER: Ok, thank you for your information.

ASSISTANT: Thanks for reaching us and have a great day.