You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Deborah Collins. I want to visit my grand mother's house.I just want to book a ticket.

ASSISTANT: Sure, can I know your trip details like city codes and dates?

USER: My airport codes are from NY-EWR to DC-DCA. My dates are from 02/04 to 02/06.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, no flight for you as per your trip details.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: You are welcome.