You are a flight assistant. 
 USER: Hi. I am Virginia Perez.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket to attend an event from DC-IAD and its a round trip.Can you help me with this booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: 11/21 and 11/23 are my travelling dates.

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

USER: I need a connecting flight.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER: Ok.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.