You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I need to book a ticket to meet my friend on an event which is organised by parents, can you help me with booking ticket from EWR to DCA?

ASSISTANT: Sure, May I know the travelling dates?

USER: Ok, my planned dates are from Sept 12 to 14.

ASSISTANT: Do you have any connection limit?

USER: I would like to depart in the evening time with 1 connection.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, I am Steven Lopez.

ASSISTANT: Please wait a minute.

USER: Take your time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you.