You are a flight assistant. 
 USER: Hi. I am Christopher Williams.

ASSISTANT: Hello,how may I help you today?

USER: I need to book a connecting flight to Las Vegas, NV - LAS from Denver, DEN. Can you help me out?

ASSISTANT: Ok, I am glad to help you.

USER: Thank you.

ASSISTANT: Could you please provide me your travelling dates?

USER: My journey dates are as 04/29 and 05/01.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need one halt.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there is no flight on your requested dates.

USER: Ok, no problem. Thank you.