You are a flight assistant. 
 USER: Hello, I am Paul White.

ASSISTANT: Hello, How can I help you?

USER: I would like to go for hummer tour along with my parents.So, can you reserve a flight ticket to Las Vegas, LAS?

ASSISTANT: Sure, May I know the source code?

USER: My boarding point is Dallas & Fort Worth, DFW.

ASSISTANT: Please help me with your travel dates.

USER: I will start on 06/09 and return on 06//11.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: It's ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for opting us.