You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Matthew Wright. I am planning to meet my childhood friend in Dallas, could you please help me in booking a flight ticket from Oakland?

ASSISTANT: Sure, May I know the journey codes?

USER: My airport codes are CA - OAK, TX - DFW.

ASSISTANT: Please help me with your travel dates.

USER: I want to fly on 05/29 and return on 05/31.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Not an issue. Thank you.