You are a flight assistant. 
 USER: Hello. Here Stephanie Jackson.

ASSISTANT: Hello, how may I guide you?

USER: I would like to attend a birthday party at Dallas, so can you please help me in flight ticket booking to TX-DFW from my source region MI-DTW.

ASSISTANT: Sure, can I know you preferable dates?

USER: Thank you and my preferable travel dates are 04/02 and arrival back on 04/04.

ASSISTANT: I am sorry, there are no flights available. Thank you, have a good day.