You are a flight assistant. 
 USER: Hi. Donald Green here.

ASSISTANT: Hello, how may I be at your service today?

USER: I would like to book a ticket from PHL to LAS, can you please help me with that?

ASSISTANT: Sure, may I know on which dates you are willing to travel?

USER: The travel dates are from Jul 06 to Jul 08.

ASSISTANT: Do you prefer business or economy class in your journey?

USER: My depart time is at evening.

ASSISTANT: Is there any more specifications in your journey?

USER: I need a flight with 1 connection.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights are available on your given details.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for approaching us.