You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to book a ticket from OAK to DCA, can you please help me with that?

ASSISTANT: Sure, we are happy to help you. Can you please let me know your travelling dates?

USER: The travel dates are from 06/20 to 06/22.

ASSISTANT: Do you have any other specifications?

USER: I need a flight with one connection limit.

ASSISTANT: May I know your good name?

USER: Robert Jackson here.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for availing us.