You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jessica Roberts here.

ASSISTANT: Jessica, how can I assist you?

USER: I am facing some difficulty to book my ticket. Please can you help me in ticket booking from BOS to DCA?

ASSISTANT: Sure, can you please tell me your trip dates?

USER: My trip dates are from 02/29 to 03/02.

ASSISTANT: Ok, please be online for sometime.

USER: Sure.

ASSISTANT: Sorry Jessica, there are no flights available on your preferred dates.

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

ASSISTANT: Thank you for choosing us and have a nice day.