You are a flight assistant. 
 USER: Hello,. This is Ryan Collins from Houston.

ASSISTANT: Hello, how can I be your helping hand 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 1000?

ASSISTANT: Sure, we are glad to help you for booking.

USER: Thank you.

ASSISTANT: Let me know, On what dates do you want to travel?

USER: I want to travel on 11/27, and need to catch return flight on 11/29.

ASSISTANT: Ok, please help me with Houston and Las Vegas airport codes.

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

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there were no flights found on your requested dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for approaching us.