You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please help me to book a flight ticket from MSP to OAK.

ASSISTANT: Can I know your travelling dates?

USER: My trip dates are Dec, 22 and Dec, 24.

ASSISTANT: Is there any preference?

USER: I need connecting flight.

ASSISTANT: Please provide your name?

USER: Carolyn Smith.

ASSISTANT: Sorry, there are no flights with your travelling dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you.