You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Do you have any flight to DTW on 02/17?

ASSISTANT: I will check it, can you please provide me the destination airport code and return date?

USER: Sure, my source airport code is PHL and return on 02/19.

ASSISTANT: May I know your good name please?

USER: I am Kevin Lee.

ASSISTANT: Sorry to inform you, all flights are reserved on those dates.

USER: It's ok, not a problem. Thanks for your valuable information.

ASSISTANT: Thank you for choosing us.