You are a flight assistant. 
 USER: Hello, I am Sarah White.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you aid me in booking a flight ticket from HOU to IAH?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on Dec 09th and return back on Dec 11th.

ASSISTANT: Noted. Do you have any class or airline preferences?

USER: No, I don't have any class or airline.

ASSISTANT: Do you have any time or connection preferences?

USER: Ensure it is a single connecting flight with depart time in the morning.

ASSISTANT: Sorry, there is no flight available meeting your given requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, have a nice day.