You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Donna Anderson. I want to book a flight ticket from SFO to SEA. Could you help me in booking?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: My travelling dates are from Oct 26-28.

ASSISTANT: Do you have any requirements?

USER: I need a halt.

ASSISTANT: Sorry to say, there is no flight is available for you.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.