You are a flight assistant. 
 USER: Hello, I'm Rachel Carter.

ASSISTANT: Hello, How can I assist you?

USER: I want to attend my nephew's wedding at Philadelphia, PA - PHL. Can you please book a ticket with a halt?

ASSISTANT: Sure, May I know the source code?

USER: I prefer to board at DTW.

ASSISTANT: Please help me with your travel dates.

USER: I would like to depart on 01/28. I intend to return on 01/30.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for choosing us.

USER: No issue. Thanks for your information.