You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: My name is Stephanie Walker, I want to book a flight to visit Boston city to attend a meeting. Can you book a flight with in fare of 200?

ASSISTANT: Sure, May I know the journey codes?

USER: I will fly from New York, NY-LGA to airport Boston, MA-BOS.

ASSISTANT: Please help me with your travel dates.

USER: I like to travel on 11/07 and return on 11/09.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.