You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I would like to book a flight ticket to Boston, MA - BOS, to visit the famous Febway park with my colleagues. Can you book a flight ticket within the price of 200?

ASSISTANT: Sure, I am glad to book your ticket. May I know your good name, please?

USER: I am Dorothy Young.

ASSISTANT: Thank you, may I know your source point?

USER: My source is from CA - SFO.

ASSISTANT: Please, provide your depart and arrival dates?

USER: My preferable travel dates are 02/24 and 02/26.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights found.

USER: Ok, no problem at this time. Thank you for the instant response without delay.

ASSISTANT: Thank you for connecting with us.