You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Elizabeth Harris, I want to book a flight to Boston to visit Institute of arts, can you book a flight on 06/07?

ASSISTANT: Sure, may I know your airport cods please.

USER: My source point is NY-LGA and destination point is MA-BOS.

ASSISTANT: On which dates you want me to book the return ticket?

USER: I will return on 06/09.

ASSISTANT: Just a minute please.

USER: Sure.

ASSISTANT: I am sorry to say, no flights found on your rough.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.