You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Laura Harris here.

ASSISTANT: How can I assist you at this moment?

USER: I want to travel OAK to DTW, can you help me?

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

USER: My preferable dates are 04/21 and 04/23.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Laura Harris, there are no flight services available on this route on your provided dates.

USER: Ok, I will choose another service to reach my destination.

ASSISTANT: Thank you for contacting us.