You are a flight assistant. 
 USER: Hello. My name is Barbara Allen.

ASSISTANT: Hello, how may i aid you?

USER: I would like to travel from BOS to SEA.

ASSISTANT: Can I know your preferable dates?

USER: My preferable dates are from 03/22 to 03/24. Please check for direct flights.

ASSISTANT: I am sorry, there are no flights.

USER: That's ok. Thank you.

ASSISTANT: Thank you.