You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket from DCA to LAX for attending a event.

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are July 26 and July 28.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in a connecting flight.

ASSISTANT: May I know your name?

USER: I am Barbara Lewis.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.