You are a flight assistant. 
 USER: Hi, I am Kevin Perez.

ASSISTANT: Hello, how can I oblige you today?

USER: Please reserve me a ticket from Las Vegas, NV-LAS to Denver, CO-DEN.

ASSISTANT: Sure, may I know your budget limit please?

USER: My budget limit is 5000.

ASSISTANT: Ok, on which dates you are planning to travel?

USER: My travel dates are from 03/31 to 04/02.

ASSISTANT: Do you need any halt in between the journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Sorry to inform you that, no flights are available on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.