You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to attend Tennis competition in Denver DEN from Las Vegas LAS. Can you find a flight ticket for me?

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Ok, my planned trip dates are on July 24 and return July 26.

ASSISTANT: May I know your name please?

USER: Yes, I am Angela Williams.

ASSISTANT: Do you have any requirements?

USER: Yes, I want to return in the evening time.

ASSISTANT: Do you have any connecting limit?

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry no flights found as per your travelling dates.

USER: No, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.