You are a flight assistant. 
 USER: Hello. I am Ronald Brown.

ASSISTANT: Hello, how may I aid you today?

USER: I want to travel from LAS to IAH. Can you help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I want to fly in the flight on 10/20 and 10/22.

ASSISTANT: Sorry Brown, there is no flight in your route with your travel dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.