You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Gregory Green. I need to book a ticket with fare of 1000 to meet my childhood friends in my Hometown.

ASSISTANT: Ok.

USER: Could you please help me in booking a ticket to Detroit?

ASSISTANT: Sure. May I know your travelling dates?

USER: I would like to start on 04/08 and will be land at Atlanta on 04/10.

ASSISTANT: Can you share me your airport codes?

USER: My source code is Atlanta GA-ATL and my destination code is Detroit MI-DTW.

ASSISTANT: Thanks for your details. There are no flights available to your destination.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.