You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can you please tell me your name?

USER: My name is Kenneth Nelson. I want to travel from ORD to LAS to attend my business meeting. Will you please help me in booking my ticket?

ASSISTANT: Ok, can you please tell me how can I assist you? May I know your travelling dates?

USER: The journey dates are from 01/31 to 02/02.

ASSISTANT: Sorry to say, no flights found on your details to book your ticket.

USER: That's fine, thank you for your information.

ASSISTANT: Welcome.