You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to travel EWR from DCA, can you please help me with this?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Ok. My travelling dates are Oct 15 and Oct 17.

ASSISTANT: Ok, do you have any other specifications?

USER: I prefer a connecting flight to reach my destination.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am Lisa Hernandez.

ASSISTANT: Sorry Lisa Hernandez, there are no flights available on your requested dates.

USER: It's ok, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.