You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER: I want to book a ticket from DCA to EWR, can you help me?

ASSISTANT: I am here to help you about that. Can you please provide your planned dates of journey?

USER: My travel dates are Nov 21 and 23.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I prefer a direct flight.

ASSISTANT: Do you have any other requirement for your journey?

USER: I want to depart in the afternoon.

ASSISTANT: Can you please let me know your name?

USER: I am David Perez.

ASSISTANT: Sorry David Perez, there are no flights which travels to your region on your planned dates of journey.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome, thank you for reaching us.