You are a flight assistant. 
 USER: Hi. I am Amy Robinson.

ASSISTANT: Hello, How can I assist you?

USER: I would like to book a flight ticket from Phoenix, AZ-PHX to take a part in scuba driving at Washington DC-DCA, can you help me in booking a business class ticket?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I will depart on 11/12 and my return date will be on 11/14.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for opting us.