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

ASSISTANT: Hello, what can I do for you?

USER: Please help me assist me to book a connecting flight from Dallas to take a part in scuba driving at Evans river in Oakland.

ASSISTANT: Sure, may I know your intended dates of travel?

USER: I will depart on 08/25 and my return date will be on 08/27.

ASSISTANT: Could you help me with your journey airport codes please?

USER: I want to start from Dallas, TX-DFW to reach Oakland, CA-OAK.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: We found a AA airline with flight number 1007 and price of 200.

USER: That's perfect, please confirm my ticket.

ASSISTANT: Your booking is done.

USER: Thank you for your help in booking.

ASSISTANT: Thank you for picking us.