You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: My name is Paul Williams, and I want to cancel my reservation. Will you please help me with that?

ASSISTANT: Sure, we are here to help you. Please give me a minute, I will check and revert you.

USER: OK.

ASSISTANT: Thank you for your patience, we are sorry to say we did not find any reservation with your name.

USER: OK. no problem. Thank you for your information.

ASSISTANT: Thank you for availing our services, have a nice day.