You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have to attend a Music Concert at Phoenix, could you please help me with booking a flight ticket from DCA to PHX?

ASSISTANT: Provide me with the travel dates please.

USER: I would like to depart on May 10th and return on May 12th.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: May I know the class preference?

USER: I need a business class ticket.

ASSISTANT: Are there any more preferences?

USER: I have no other preferences.

ASSISTANT: May I know your name please?

USER: I am Nancy Williams.

ASSISTANT: Sorry to inform that there are no flights on your route with the given preferences.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.