You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a flight ticket from ORD to LAS, Can you please help me for booking?

ASSISTANT: Sure, please share your travel dates.

USER: I would like to travel on 09/11 to return on 09/13.

ASSISTANT: Do you need a break in between your journey?

USER: I need a direct flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your good name?

USER: Thomas Allen.

ASSISTANT: Sorry, there is no flight services available on your required dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.