You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from HOU to LAS?

ASSISTANT: Sure, let me know your travel dates please?

USER: Sure, I want to travel on Sept 15 and need to return on Sept 17.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you need any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: Carol Allen.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.