You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How can I be your helping hand?

USER: I am Barbara Carter. I need to attend film festival in Las Vegas, LAS.

ASSISTANT: Ok.

USER: Will you help me in booking me a flight on 07/12?

ASSISTANT: Sure, how much you can afford for a ticket fare?

USER: 5000 is the budget.

ASSISTANT: When you want to return?

USER: I will return on 07/14.

ASSISTANT: May I know your source airport code please?

USER: My source airport is Detroit, DTW.

ASSISTANT: Sorry, there were no flights found to your preferable locations.

USER: Ok, I will choose other airline.

ASSISTANT: Thanks for availing us.

USER: Thank you for assisting me.