You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Paul King. I would like to travel from BOS to SFO.

ASSISTANT: Ok, please help me with your travel days to proceed.

USER: My preferable dates are from 02/27 to 02/29.

ASSISTANT: Sorry, no flights are available on your given details.

USER: That's ok. Thank you.

ASSISTANT: Most welcome.