You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Matthew Perez, want to travel from IAD to DCA. Please help me in booking my ticket.

ASSISTANT: Sure, I know your trip dates?

USER: Sure, my travelling dates are from 07/25 to 07/27. Please check the flight with 1 connection.

ASSISTANT: Sorry, on these route no connecting flights are available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.