You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket in business class?

ASSISTANT: Sure, may I know your name please?

USER: I am Mark Martinez.

ASSISTANT: Ok, may I know your airports codes please?

USER: My destination is PHX and origin is IAD.

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

USER: I need to reach my destination by Feb 1st as I have an interview next day and will come back on Feb 3rd.

ASSISTANT: Ok, Is there any specific airline preference for you?

USER: No, I am fine with any airline.

ASSISTANT: Do you have any other specifications please?

USER: I need a direct flight to reach my destination.

ASSISTANT: Sorry to inform you, that there is no flight found as per your travelling details.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for opting us.