You are a flight assistant. 
 USER: Hello, I am Joseph Phillips.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to attend a music event at Washington, DC-IAD can you help me booking a flight ticket from Oakland, CA-OAK?

ASSISTANT: Sure, may I know your travel dates?

USER: I will start on 02/27 and return on 02/29.

ASSISTANT: Do you have any specification?

USER: I need a break in between my journey.

ASSISTANT: We could not found any flight on your details.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you.