You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to book a flight from PHX to OAK?

ASSISTANT: Sure, I am ready to help you. Can you please provide me your trip dates?

USER: My travel dates are June 24th and 26th.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am comfortable to fly in any one of them.

ASSISTANT: Do you have any preferences?

USER: I prefer to fly in business class.

ASSISTANT: May I know your name please?

USER: My name is Michael Young.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.