You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I guide you at this moment?

USER: Could you please help me in making an airline reservation from LAS to HOU?

ASSISTANT: Sure, do you need any class preference?

USER: I am comfortable to travel with any class.

ASSISTANT: Ok, on which dates would you like to travel?

USER: I would like to travel on Nov 16th and return on Nov 18th.

ASSISTANT: Ok, Is there any thing else that I need to help you?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your good name please?

USER: William Harris.

ASSISTANT: There are no directs flights available at this moment.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.