You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need  to attend a wedding party in EWR from DCA, can you help me to find a flight?

ASSISTANT: Sure, on which dates you want to book your ticket?

USER: I want book on 03/27 and return to my city on 03/29. I need flight with a single connection.

ASSISTANT: Ok, may I know your name in the meanwhile?

USER: Brenda Gonzalez here.

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

USER: It's ok, anyway thank you for your information.

ASSISTANT: Welcome Brenda Gonzalez.