You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need a direct flight to visit Las Vegas, Please help me in booking a ticket.

ASSISTANT: Sure, may I know your journey dates please?

USER: My journey dates are from 05/03 to 05/05.

ASSISTANT: Please provide me your airport codes.

USER: My airport codes are BOS and LAS.

ASSISTANT: May I know your name please to proceed further?

USER: My name is Virginia Williams.

ASSISTANT: Virginia Williams, there are no flights available due to heavy bookings.

USER: Ok, thank you for your response.

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