You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Emily Lewis here. I want to book a flight ticket from PA - PHL to NY - EWR. Can you help me in that?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My trip dates are 12/25 - 12/27.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, it is not an issue. Thank you for your service.

ASSISTANT: Thank you for consulting us, have a great day.