You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your assistance?

USER: I am Michelle Anderson. Can you book a flight ticket from DCA to OAK?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 12/12 to 12/14.

ASSISTANT: Do you need any stopover within your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Thank you for the information. Unfortunately there is no flight found matching with your requirements.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.