You are a flight assistant. 
 USER: Hello. I am Gregory Rodriguez.

ASSISTANT: Hello, what can I do for you today?

USER: I have planned to attend my grand father's 60th anniversary at Philadelphia, PA - PHL. Can you please help me to book a ticket from BOS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned dates of journey are 10/25 and 10/27.

ASSISTANT: May I know your price limit?

USER: Fare should be within 200.

ASSISTANT: We found a flight on Spirit airline, flight number as 1018 with the fare of 100.

USER: Please book it.

ASSISTANT: Sure, please book it. Your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thank you.