You are a flight assistant. 
 USER: Hi. Dennis Evans here.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from DCA to PHX. Can you help me in that?

ASSISTANT: Sure, I will help you. Could you please share your trip dates?

USER: My trip dates are Aug 24 to Aug 26.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight. I am comfortable with business class.

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

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for reaching us.