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

ASSISTANT: Hello, How can I assist you?

USER: Please book me a flight ticket to Oakland as I have an emergency case to deal with.

ASSISTANT: Sure, May I know the journey codes?

USER: I need to leave from my nearest airport ORD to reach OAK.

ASSISTANT: Please help me with your travel dates.

USER: I want to travel on 02/04, and need to catch return flight on 02/06.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: We have found a direct flight from Hawaiian airline. Shall I proceed?

USER: No, do not proceed. Thanks for the information.

ASSISTANT: Thank you for opting us.