You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: I would like to attend a meeting at Boston, please help me in booking a ticket.

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: Sure, my travelling dates are 07/19 and 07/21.

ASSISTANT: Ok, may I know the airport codes please?

USER: My airport codes are SEA and BOS.

ASSISTANT: May I know your name please?

USER: My name is Larry King.

ASSISTANT: Sorry, there are no flights found on your requirement.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for approaching us, have a nice day.