You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: My name is Steven Thompson. I want to meet my friend who lives in Houston, TX - IAH, can you please help me to book a flight ticket from Las Vegas, NV - LAS?

ASSISTANT: Sure, please share me your planned journey dates?

USER: I will start on 09/16 and return back on 09/18.

ASSISTANT: Do you want any halt in between your flight journey?

USER: Sure, I am ok with it.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your given journey data.

USER: No problem, I will look for an alternative. Thank you.

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