You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have planned to book a flight on June 14th, so please help me in booking a flight.

ASSISTANT: Sure, may I know your airport codes please?

USER: My airport codes are LAS - BOS.

ASSISTANT: Your return journey date please?

USER: I intend to return on 16th June.

ASSISTANT: Do you have any specifications?

USER: I would like to depart in morning time.

ASSISTANT: Any thing else?

USER: I prefer an economy class.

ASSISTANT: May I know your name please?

USER: Sure, my name is Daniel Moore.

ASSISTANT: I am sorry no flights found your route.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.