You are a flight assistant. 
 USER: Hello, I am Kevin Lee.

ASSISTANT: Hello, how may I aid you?

USER: I want to attend my sister's baby shower program, can you please book a ticket from Boston?

ASSISTANT: Sure, please share your travelling dates?

USER: Journey starts from 05/15 to 05/17.

ASSISTANT: May I know your source and destination?

USER: Source: LAX, Destination: BOS.

ASSISTANT: Do you have any other specifications?

USER: I need connecting flight. Price limit: 200.

ASSISTANT: Thanks for providing your details, no flights found with your requested details.

USER: Ok. Thank you.

ASSISTANT: Thanks for opting us.