You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: As I am a doctor, I want to conduct a free Medical camp at Philadelphia, PA - PHL. Can you please book a ticket on 02/01?

ASSISTANT: Sure, please provide me your source airport.

USER: My source is Detroit, MI - DTW.

ASSISTANT: Ok, on which date you want to return?

USER: I intend to return on 02/03.

ASSISTANT: Do you have any other requirements?

USER: Yes, I need a halt.

ASSISTANT: May I know your name please?

USER: Sure, I am Lisa Martin.

ASSISTANT: Sorry, no connecting flights available with your given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you.