You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to book a flight from BOS to DCA?

ASSISTANT: Please provide your travelling dates.

USER: I want to depart on Feb 1 and need to return on Feb 3.

ASSISTANT: Do you have specification?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: Edward Gonzalez here.

ASSISTANT: Sorry, there is no flight with your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for checking.