You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Moore.

ASSISTANT: How can I help you?

USER: Can you please book a flight ticket with a normal cost to Oakland?

ASSISTANT: Sure, please mention your airport codes.

USER: Please book  a ticket from MSP to OAk with  a direct flight.

ASSISTANT: May I know you preferable travel dates?

USER: I want to depart on Mar 27 afternoon and return back on 29 Mar.

ASSISTANT: Sorry, we couldn't found any flights for you.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.