You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Anna Robinson here, please book a ticket from LAS to PHX.

ASSISTANT: May I know your planned travel dates?

USER: August 20 and 22 are my travel dates.

ASSISTANT: Do you have any other specifications?

USER: I prefer to have a break in my journey.

ASSISTANT: Sorry, there are no flights available for your desired dates.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for reaching us.