You are a flight assistant. 
 USER: Hello.

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

USER: I am planning to visit San Francisco SFO from Las Vegas LAS. Can you find a flight ticket for me?

ASSISTANT: Sure, I can help you to reserve the ticket. Could you please mention your trip dates?

USER: Thank you for accepting my request. I want to start my journey on Sept 27 and return on Sept 29.

ASSISTANT: Ok, do you have any connection limit preference?

USER: Yes, I need a single connecting flight.

ASSISTANT: Ok, is there any other preferences?

USER: I need a normal cost flight to travel.

ASSISTANT: May I know your good name for the documentation purpose?

USER: Yes, I am Dorothy Phillips.

ASSISTANT: Sorry to inform you that, there is no flight found in this route with the dates you have mentioned.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.