You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Jason Rodriguez. I would like to travel from DCA to BOS, could you help me out?

ASSISTANT: We are perky to help you. Can you share me your preferable dates?

USER: My preferable dates are from 06/12 to 06/14.

ASSISTANT: Just give a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: That's ok.

ASSISTANT: Thank you for opting us.

USER: Thank you.