You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Anna Rodriguez want to attend a workshop at Phoenix, can you book a ticket from DTW to PHX?

ASSISTANT: Sure, may I know your planned travelling dates?

USER: Sure, my travelling dates will be 10/30 and 11/01.

ASSISTANT: Sorry Anna, all flights are busy on your planned travelling dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for opting us, have a great day.