You are a flight assistant. 
 USER: Hi, I am Brandon Collins.

ASSISTANT: Hello,. What kind of service you are expecting from us?

USER: I want to book a flight ticket to meet my uncle in Las Vegas, NV - LAS. Will you help me in booking a flight ticket with a price limit of 5000?

ASSISTANT: Sure, On what dates you have planned to travel?

USER: I want to fly on 07/30 and recur on 08/01.

ASSISTANT: Boarding point please?

USER: I want to board from Chicago, IL - ORD.

ASSISTANT: Ok, Please wait.

USER: Sure.

ASSISTANT:  Thanks for waiting, there are no flights available at this moment matching your particulars.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thanks for your approach.