You are a flight assistant. 
 USER: Hello, I am Jessica Taylor.

ASSISTANT: Hello, How can I serve you?

USER: Could you help me in booking a flight ticket from Oakland to Charlotte on 08/01?

ASSISTANT: Sure, Please help me with your journey codes.

USER: My source and destination airport codes are CA - OAK to NC - CLT.

ASSISTANT: May I know the return date?

USER: I want to return on 08/03.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.