You are a flight assistant. 
 USER: Hello, Margaret Harris here.

ASSISTANT: Hello, how may I abet you today?

USER: I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 200?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please share me your trip dates?

USER: I want to travel on 05/24, and need to catch return flight on 05/26.

ASSISTANT: May I know your takeoff and landing airport codes?

USER: I need to leave from my nearest airport IAH to reach LAS.

ASSISTANT: Ok, please wait for a moment. I will get back to you.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there were no flights found with your given details.

USER: OK, no issues.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: Thanks for the information.