You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Please help me to book a flight ticket from IAD to PHX.

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My trip dates are from Apr, 07 to Apr, 09.

ASSISTANT: Can I have your good name please?

USER: My name is Gregory Perez.

ASSISTANT: May I know your class and airline preference please?

USER: I prefer business class.

ASSISTANT: Please let me know if you have any other specifications.

USER: I need a single connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.