You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you book a connecting flight from PHX to ATL to attend my friend's marriage?

ASSISTANT: Sure, let me know your travel dates please?

USER: My planned travel dates are Mar, 20 and Mar, 22.

ASSISTANT: Ok, is there any class preference?

USER: I need business class ticket.

ASSISTANT: Do you have any depart and arrival timings?

USER: My depart time should be at evening.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Can I know your name please to proceed further?

USER: Anthony Lewis here.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: It's ok, not a problem. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.