You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your name?

USER: I am Kenneth Williams. Can you help me in booking a flight from DTW to LAS?

ASSISTANT: Sure Kenneth Williams, Will you provide me your travelling dates?

USER: 06/17 to 06/19.

ASSISTANT: Sure, just hold on.

USER: Ok.

ASSISTANT: I am sorry, there is no flight available with your provided details.

USER: Ok. Thank you.

ASSISTANT: You are welcome.