You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER:  I am Charles Parker, want to book a flight ticket to Boston with price under 200. Can you help me with it?

ASSISTANT: Sure, can you please share me your journey points?

USER: Journey dates are 03/31 and 04/02. My journey points are ORD-BOS.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for availing us. Have a good day.