You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I need to attend mechanical workshop, can you please book the ticket from PHL to LAX?

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

USER: Sure, my planned departure and return travel dates are 26th and 28th of Aug.

ASSISTANT: May I know your name?

USER: My name is Samantha Perez.

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

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

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