You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Betty Phillips. I would like to book a ticket from PHL to LAS, can you please help me out?

ASSISTANT: Sure, I am happy to help you with that. Can I know your travelling dates?

USER: I am travelling on these dates July 9th and 11th.

ASSISTANT: Do you have any other specifications?

USER: I prefer return time in the afternoon.

ASSISTANT: Do you have any other preferences?

USER: I need an economy class.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey details.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.