You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Shirley Roberts here.

ASSISTANT: How can I help you at this moment?

USER: Can you please help me in booking a flight ticket from IAD to DTW?

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

USER: Sure, my travelling dates are from 09/09 to 09/11.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Shirley Roberts, 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.