You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Robert Clark. I would like to travel from IAH to PHX, could you help me out?

ASSISTANT: May I know your desired travel dates please?

USER: My preferable dates are from 06/24 to 06/26. Please check for direct flights.

ASSISTANT: Sorry to say, there is no reservation on your desired travel dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Thank you for opting us.