You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Angela Lewis here.

ASSISTANT: How can I guide you at this moment?

USER: Can you please help me in booking a flight ticket from LAS to DEN?

ASSISTANT: Sure, I will help you with this. Can you please provide your travel dates to proceed further?

USER: Sure, my trip dates are from 12/25 to 12/27.

ASSISTANT: Give me a moment please, let me search for the flights availability on this route.

USER: Sure, I will wait for your response.

ASSISTANT: Angela Lewis, there are no flight services available on this route on your provided dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for contacting us.