You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jacob Green here.

ASSISTANT: How can I assist you Green?

USER: I am looking to book a flight ticket to New York for having a grand wedding of my cousin.So, can you please help me to book a flight ticket from Boston?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are from 08/01 till 08/03.

ASSISTANT: Can I know the airport codes please?

USER: My source code is BOS and my destination code is LGA.

ASSISTANT: Ok, wait a moment please.

USER: Ok, take your own time.

ASSISTANT: There is a flight with price 400 in UA airline, shall I book it?

USER: Please search the flight with price 200.

ASSISTANT: Sorry Green, there are no flights with price 200.

USER: It's ok, thank you.

ASSISTANT: You are welcome.