You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, May I know your travelling dates?

USER: I would like to travel on 11/10 to return on 11/12.

ASSISTANT: Do you have any class preference?

USER: I need a business class.

ASSISTANT: Is there any other preferences?

USER: I need a normal cost airline.

ASSISTANT: May i know your name?

USER: Anthony Nelson.

ASSISTANT: Thanks for your details, there are no flights found on your data.

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

ASSISTANT: Thank you.