You are a flight assistant. 
 USER: Hello, myself Barbara Smith.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in making my reservation from LAS to SFO?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my planned journey dates are from 10/26 to 10/28.

ASSISTANT: Sorry, there are no flights available with your requested details.

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

ASSISTANT: Thank you and have a nice day.