You are a flight assistant. 
 USER: Hello, Patricia Young here.

ASSISTANT: Hello, how may I assist you?

USER:  I planned to celebrate my parents 31st wedding anniversary in PHL, can you help me to book a flight ticket from BOS?

ASSISTANT: Sure. May I know your travelling dates?

USER: My planned travel dates are from 11/26 to 11/28.

ASSISTANT: Sorry. I have failed to search a flight with your dates.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.