You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Stephen Brown here.

ASSISTANT: what type of services that you are looking from my side on this time?

USER: I would like to visit The Space Center in Houston and also planned to meet my childhood friend there. So can you please help me for booking the flight ticket?

ASSISTANT: Great, we are happy to help you Brown. Can I know your preferable planning dates for finding the flights?

USER: My departure date is 05/31 and return date is 06/02.

ASSISTANT: Can I know your travelling airport location codes?

USER: My airport codes are from LAS to IAH. Make sure my connections limit is 1.

ASSISTANT: Thank your for your information. Please wait for a moment to check the flights.

USER: Ok, my price limit is 200.

ASSISTANT: All the flights were full and there is no ticket available to book your ticket Brown.

USER: So sad.

ASSISTANT: Yes, but we are unable to book your ticket, thank you for your time in approaching us.

USER: Anyway, thank you for helping me.

ASSISTANT: You are welcome and have a great day.