You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Raymond Garcia want to visit Boston, can you book a ticket from LGA to BOS?

ASSISTANT: Sure, I will help you in booking the flight ticket. May I know your travelling dates please?

USER: Sure, my travelling dates will be 06/05 and 06/07.

ASSISTANT: Sorry, there are no flights found in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.