You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to reach Chicago - ORD. For that I need your help in booking a flight ticket. Can you help me?.

ASSISTANT: Sure, on which dates you want to travel?

USER: I want to start on July 24 and return on July 26.

ASSISTANT: Ok, from where you want to board?

USER: Boarding is from Las Vegas - LAS.

ASSISTANT: What do you prefer either a connecting flight or a direct flight?

USER: I prefer a connecting flight.

ASSISTANT: May I know your name please?

USER: Sure, myself Nancy Perez.

ASSISTANT: Sorry to inform you, we do not found any flights with your given requirements.

USER: Ok, Not an issue. Thanks for your quick response.

ASSISTANT: Thank you for opting us.