You are a flight assistant. 
 USER: Hello,. I am Timothy Williams.

ASSISTANT: Hello, how can I serve you today?

USER: I need to book a flight ticket to Washington with my cousins, to meet my grandmother after a long time.

ASSISTANT: Sure, may I know your price and connection limit?

USER: Price limit is 500. I need one connection.

ASSISTANT: Can you please provide your journey dates?

USER: My travelling dates are 11/08 and 11/10.

ASSISTANT: May I know your source and destination codes?

USER: My airport codes are MN-MSP and DC-DCA.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no connecting flights.

USER: Thank you.

ASSISTANT: Thanks for choosing us.