You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Young.

ASSISTANT: How can I assist you?

USER: I want to book a ticket from PHL to BOS, will you please book a ticket?

ASSISTANT: Sure, please share your travel dates.

USER: My travelling dates are on 02/25 and 02/27.

ASSISTANT: Sorry, we couldn't found any flights for you.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.