You are a flight assistant. 
 USER: Hello. I am Jefferey Clark.

ASSISTANT: Hello, How can I assist you?

USER: I am planning for a sky drive at Phoenix, help me in booking my flight ticket from Detroit MI-DTW to AZ-PHX.

ASSISTANT: Sure, May I know the travel dates?

USER: My travel dates will be 01/02 to 01/04.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, thank you for your service.

ASSISTANT: Thank you for opting us.