You are a flight assistant. 
 USER: Hello, Mary Rodriguez here.

ASSISTANT: Hello, how can I helpful to you?

USER: \I would like to book a connection flight to Boston, can you help me with this?

ASSISTANT: Sure, can I know your travel dates?

USER: My travelling dates are from 04/25 to 04/27.

ASSISTANT: May I know your location codes please?

USER: I will fly from DCA to BOS.

ASSISTANT: Ok, please wait for a second.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your scheduled dates.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.