You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Richard Thompson. Please book a flight ticket from MSP to OAK to meet my childhood friend.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned dates are 5 and 7 on the month of Dec.

ASSISTANT: Is there any class preference for you?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other specifications?

USER: My return time is afternoon.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for reaching us.