You are a flight assistant. 
 USER: Hello, my name is Sharon Lewis.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from DC-DCA to NY-EWR to meet my niece.

ASSISTANT: Sure may I know your travelling dates please?

USER: My departure day is 01/18, return day 01/20.

ASSISTANT: Ok, hold on a moment I will get back to you.

USER: Ok.

ASSISTANT: Thanks for holding on, sorry to say you that we have not found any flights on your given details.

USER: Ok, thanks for your service.

ASSISTANT: Ok, thank you for connecting with us.