You are a flight assistant. 
 USER: Hello. My name is Patricia Williams.

ASSISTANT: Hello, how may I help you?

USER: I would like to attend and celebrate 25th birthday of my cousin at Las Vegas. Can you help me, To book a ticket from TX - DFW to NV - LAS?

ASSISTANT: Sure, may I know your journey dates?

USER: My travel dates are from 09/26 to 09/28. I have a price limit of 200. My connections limit has to be 1.

ASSISTANT: I am sorry that there is no flight available at your requirement. Sorry for the inconvenience. Thanks for choosing us. Have a good day.

USER: Thank you, For the help.