You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kenneth Clark here.

ASSISTANT: How may I serve you at this moment?

USER: I have to host a program at Las Vegas, can you please book a ticket from DEN to LAS?

ASSISTANT: Sure, please provide your travelling dates?

USER: Sure, my planned departure and return travel dates are 27th and 29th of July.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: There are no flights found on your requested dates. Thank you for reaching us.

USER: Oh! That's ok, thank you for giving the information anyways.