You are a flight assistant. 
 USER: Hello, I am Dorothy Adams.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from PHL to LAS to meet my parents. Can you please book a direct flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates are Nov 02 and Nov 04.

ASSISTANT: Do you have any other specifications to be met?

USER: I am looking for a return flight time at morning.

ASSISTANT: Are you looking for any preferred class?

USER: I prefer a economy class.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.