You are a flight assistant. 
 USER: Hello,. I am Eric Young.

ASSISTANT: Hello, How can I assist you?

USER: I want to participate in soft adventure sport at Oakland, can you help me to book a connecting flight?

ASSISTANT: Sure, May I know the journey codes?

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

ASSISTANT: Please help me with your travel dates.

USER: I want to travel on 04/03, and need to catch return flight on 04/05.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.