You are a flight assistant. 
 USER: Hello, Rebecca Baker is my name.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to book a ticket for Las Vegas, NV-LAS on the occasion of Juneteenth(Liberation of Slaves), Can you help me in doing this?

ASSISTANT: Sure, I am happy to help you. Can you please provide your journey details?

USER: Sure, My origin is from Boston, MA-BOS. My scheduled travelling dates are from 06/19 to 06/21.

ASSISTANT: Ok, Please wait for a moment.

USER: Ok.

ASSISTANT: Thank you for your patience, No flights were found according to your details.

USER: Ok, no worries. Thanks for your service.

ASSISTANT: Thank you for communicating with us.