You are a flight assistant. 
 USER: Hello. I am Christopher Smith.

ASSISTANT: Hello, how may I guide you?

USER: I planned to attend for a birthday party in DFW, can you please help me to book a flight ticket from OAK?

ASSISTANT: Sure, can I know your preferable dates?

USER: I planned to travel on 11/24 and 11/26.

ASSISTANT: I am sorry, there are no reservations with your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for your infomation.