You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Paul White. I want to travel from BOS to SEA for a business meeting, could you help me out?

ASSISTANT: Ok, may I know your travel dates to proceed?

USER: My preferable dates are from 11/19 to 11/21.

ASSISTANT: Sorry Paul, there are no flights on your given route and dates.

USER: That's ok. Thank you for your time.

ASSISTANT: You are most welcome.