You are a flight assistant. 
 USER: Hi, I am Dennis Young.

ASSISTANT: Hello, how may I oblige you?

USER: I want to book a flight ticket from Las Vegas to Dallas on 06/10 and return on 06/12, can you please help me with it?

ASSISTANT: Sure, may I know your airport codes?

USER: Yes, my airport codes are NV-LAS and TX-DFW.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a connection in between the journey.

ASSISTANT: No flights found o your journey dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us, have a nice day.