You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Edward Clark want to organize an event for special children at NC-CLT. can you book a connecitng flight?

ASSISTANT: Sure, may I know your travel dates?

USER: my travel dates are 06/12 and 06/14.

ASSISTANT: Please share your source point?

USER: I will depart from DC-DCA.

ASSISTANT: Ok, please wait a moment.

USER: ok.

ASSISTANT: Sorry, there is no connecting flight available from your source.

USER: Ok,  thank you for your response.

ASSISTANT: Thank you for reaching us.