You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in booking a flight from IAD to LAS to attend for a meeting?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates?

USER: I wish to depart on 06/09 and intend to return on 06/11.

ASSISTANT: Meanwhile, please provide your name.

USER: Sure, my name is Paul White.

ASSISTANT: Paul White, no flight services available on this route on your provided dates.

USER: No worries, thanks for your support.

ASSISTANT: Thank you for contacting us.