You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you for today?

USER: Myself Charles Evans. Can you help me in booking a flight ticket from OAK to MSP?

ASSISTANT: Yes, I can help you. Can you tell me your travelling dates?

USER: Ok, my travelling dates are Dec 23 and Dec 25.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight which returns in the afternoon.

ASSISTANT: Give me a moment.

USER: sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your information.