You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I lend a hand to?

USER: I would like to book a flight ticket from PHX to DFW, can you help me with that?

ASSISTANT: Sure, I am here to help you for this. Can you please share me your travel dates?

USER: My trip dates are 08/01 and 08/03.

ASSISTANT: Is there any preference regarding your journey?

USER: I need a connecting flight in business class.

ASSISTANT: Do you have any requirements?

USER: No.

ASSISTANT: For documentation purpose. May I know your name please?

USER: I am Charles Miller.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you very much for contacting our agency.