You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to celebrate my birthday with my parents, so please book a flight to Detroit, DTW.

ASSISTANT: Sure, may I know your journey dates?

USER: I am planning to start on 11/27.

ASSISTANT: Kindly, mention your origin airport code.

USER: Boston, BOS is my source.

ASSISTANT: Please, share your return date.

USER: I am willing to return on 11/29.

ASSISTANT: May I know your good name for further process?

USER: I am Lisa Anderson.

ASSISTANT: No flights found on your journey dates.

USER: Ok. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.