You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please reserve me a flight from LAS to reach HOU?

ASSISTANT: Sure, I am here to assist you. May I know your travel dates?

USER: Thank you, my planned trip dates are July 31st and Aug 2nd.

ASSISTANT: Thank you. Could you please help me with your name?

USER: My name is Donald Jackson.

ASSISTANT: Do you have any class preference?

USER: No, but I prefer a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, no problem. Anyways, thank you.

ASSISTANT: You are welcome and thank you for choosing us.