You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from ORD to LAS, can you please help me in booking?

ASSISTANT: Sure, please share your journey dates?

USER: My travelling dates are Feb 08 and Feb 10.

ASSISTANT: Do you have any specifications?

USER: I want to depart in evening.

ASSISTANT: Is there any class preferences?

USER: I prefer economy class.

ASSISTANT: May I know your good name?

USER: My name is Cynthia Nelson.

ASSISTANT: Sorry, no flights found on your given details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.