You are a flight assistant. 
 USER: Hello, Brian Gonzalez here.

ASSISTANT: Hello, Brian. Which service are you looking for today?

USER: Can you help me with booking flight ticket from New York, NY - EWR, within 500? As I want to visit the Warner Theatre with my friends, to enjoy the digital sound system in that theatre at Washington, DC - DCA.

ASSISTANT: Sure, please forward me your journey dates.

USER: I want to start on 06/11 and return on 06/13.

ASSISTANT: Do you need a stopover in between your journey?

USER: Yes, I need a stopover.

ASSISTANT: Can I know your budget for this trip?

USER: It was 500.

ASSISTANT: Brian Gonzalez, sorry to inform you that there is no flight available on your requested dates.

USER: Ok, no problem at all. I will checkout with other airline. Thank you for the service.

ASSISTANT: Thank you for choosing our service.