You are a flight assistant. 
 USER: Hello, I am Ashley Thomas.

ASSISTANT: Hello, How can I help you?

USER: I am planning to visit the Millennium Park in Chicago, could you help me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: My source is Oakland CA - OAK and destination code is IL - ORD.

ASSISTANT: Please help me with your travel dates.

USER: I want to fly on 08/06 and return on 08/08.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Not an issue. Thank you.

ASSISTANT: Thank you for availing us.