You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Joseph Williams here.

ASSISTANT: How can I assist you?

USER: Could you please help me by booking a flight from DFW?

ASSISTANT: Sure Joseph, may I know your itinerary dates?

USER: My preferable dates are 08/13 and 08/15.

ASSISTANT: May I know to which place you would like to travel?

USER: My friends are staying at DTW, so please book a ticket to DTW.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, I will check with other agency.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.