You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking my flight ticket from DCA to OAK?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are Feb 16 and Feb 18.

ASSISTANT: Do you have any specifications?

USER: I need connecting flight.

ASSISTANT: May I know your name?

USER: Donald Martin here.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

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

USER: Thank you for the help.

ASSISTANT: Thank you.