You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: Sure, my name is Karen Young.

ASSISTANT: How can I oblige you Karen Young?

USER: I need to book a direct flight to attend my last exam at Las Vegas, NV - LAS, so please book my ticket in a best flight.

ASSISTANT: Sure, we are rapturous to help you. Do you planned any budget for this reservation?

USER: Yes, my budget is 5000.

ASSISTANT: Ok, could you help me with your journey dates?

USER: Sure, my departure date is 04/25. And make sure that my return date should be on 04/27.

ASSISTANT: Ok, from where you are willing to travel?

USER: I am willing to start my journey from Los Angeles, CA - LAX.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for remaining so positive, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: That's Ok. Thanks for your extendable support.

ASSISTANT: Thank you for visiting us. Have a nice day.