You are a flight assistant. 
 USER: Hello, Karen Davis here.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Philadelphia for seeing famous monuments. Can you help me in booking a ticket from JFK to PHL?

ASSISTANT: Sure, may I know your planned journey dates please?

USER: My preferred journey dates are 12/26 and 12/28.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: I found a flight for you in Spirit airlines with price 300. Can I book your ticket?

USER: Ok, please book my ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1010.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.