You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: This is Kenneth Perez. I am planning to meet my friends in Las Vegas, LAS. Can you help me to book a connecting flight?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are May 9th and May 11th.

ASSISTANT: May I know your source airport codes?

USER: My airport codes are from DEN to LAS.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight as per your requests.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.