You are a flight assistant. 
 USER: Hello. I am Lisa Lopez.

ASSISTANT: Hello Lisa Lopez, how may I reach out to you?

USER: I need to book a direct flight from PHX to HOU to meet the Valley ball team in my college. Could you please help me in doing that?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: May I know your preferred dates of journey?

USER: Sure, my travelling dates are 02/09 and return on 02/11.

ASSISTANT: Ok, how much cost are you expecting for the ticket?

USER: I can pay up to 200.

ASSISTANT: Thank you for providing your essentials. It's unfortunate that there are no flight available on your required dates.

USER: No problem, thank you for your valuable information.

ASSISTANT: Thank you for picking us.