You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Donald Turner, I am travelling to Las Vegas for vacation with my friends. Can you help me to book a connecting flight?

ASSISTANT: Sure, May I know the journey codes?

USER: I will fly from CA-SFO to NV-LAS.

ASSISTANT: Please help me with your travel dates.

USER: I like to travel on 06/12 and return on 06/14.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Thank you for the details.