You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from LAS to BOS, can you help me with booking please?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: Yes, my travelling dates are June 03 and June 05.

ASSISTANT: Ok, please share your name.

USER: My name is Alexander Anderson.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, thank you for the response.

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