You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you now?

USER: My name is Jack Robinson.

ASSISTANT: Ok.

USER: I am planning to attend for a Science festival in Phoenix, so please book a direct flight for me.

ASSISTANT: Sure, I will help you with that. Can you provide your travelling dates?

USER: My departure day is 11/21, return day is 11/23.

ASSISTANT: Help me with the travelling airport codes?

USER: My source and destination airport codes are MI - DTW, AZ - PHX.

ASSISTANT: Ok, please hold on for a while.

USER: Sure.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: No problem, thank you for your help.