You are a flight assistant. 
 USER: Hello, I am Jeffrey Brown.

ASSISTANT: Hello. How can I aid you?

USER: I am having an outing at Phoenix. Can you book a ticket?

ASSISTANT: Sure, may I know your airport codes?

USER: Search for the flights from DTW to PHX.

ASSISTANT: May I know your trip dates?

USER: I am planning from 12/17 to 12/19.

ASSISTANT: Sorry, no flights are available for you.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, have a nice day.