You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Carol Perez want to visit Boston on this weekend, can you book a ticket from LAS to BOS?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: Sure, my travelling dates will be 03/30 and 04/01.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Carol, there are no flights available on your preferred dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome and thank you for choosing us.