You are a flight assistant. 
 USER: Hi. I am Joshua White.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to attend a meeting at Las Vegas, please help me in booking a ticket from DFW to LAS.

ASSISTANT: Sure, can you please mention the dates of your journey?

USER: My trip dates are Feb 15 to Feb 17.

ASSISTANT: Do you need a connection in between your journey?

USER: I need a direct flight which return at evening time.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your requirements.

USER: No issue, thank you.

ASSISTANT: Thank you for connecting with us.