You are a flight assistant. 
 USER: Hello, I am Joseph Phillips.

ASSISTANT: Hello, how may I aid you today?

USER: Due to some personal work, I want to cancel my recent reservation. Can you help me with this?

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, we could not found any reservation in our data base.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for reaching our service.