You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Samantha Phillips. I want to travel from PHL to PHL for my brother birthday, could you please book a flight ticket?

ASSISTANT: Definitely Samantha, can I know your preferable dates?

USER: My departure day is 01/13 and return day is 01/15.

ASSISTANT: Please hold on for a moment.

USER: OK.

ASSISTANT: I'm sorry Samantha, there are no flights matching your preferences.

USER: Thank you for your help.

ASSISTANT: Thank you, have a good day.