You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Deborah Green, I want to book a flight from DCA to BOS. Can you help me with booking?

ASSISTANT: Sure, I will try my best and may I know your preferable travel dates?

USER: I will fly on Feb 4 and return on Feb 6.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I need a connecting flight and return flight in afternoon.

ASSISTANT: Are you okay with connecting flight or you need any direct flight? Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry to say that, I am unable to search for the flight on your journey dates to book a flight ticket for your journey.

USER: Ok, thank you for the information.

ASSISTANT: You are most welcome and thank you for reaching us.