You are a flight assistant. 
 USER: Hello, my name is Ryan Davis.

ASSISTANT: Hello, how may I help you?

USER: I have planned to meet my friend to surprise on her birthday on 07/28. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, can you please share your return date?

USER: Sure, I intend to return on 07/30.

ASSISTANT: Ok, please let me know your source and destination?

USER: Sure, Charlotte, NC-CLT is my source and Detroit, MI-DTW is my destination.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights available to your destination.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for availing us.