You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory Johnson here.

ASSISTANT: How can I assist you?

USER: Can you please book a flight ticket from DTW to DFW?

ASSISTANT: Can I know your travel dates?

USER: Sure, I need to travel on dates of 12/23 and 12/25.

ASSISTANT: The flight 1017 of UA airlines is available on your requested dates with a price 100. Shall I proceed?

USER: It is fine, please proceed with booking.

ASSISTANT: Your reservation has done successfully.

USER: Thank you for your help.

ASSISTANT: You are welcome.