You are a flight assistant. 
 USER: hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Scott Edwards. i would like to book a flight ticket from LAS to PHL. Could you please help?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 07/30 and return 08/01.

ASSISTANT: I am sorry, there are no flights available. Thank you, have a good day.

USER: Ok, thank you for the information.