You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Dennis Phillips. I am planning to visit Museum of Nature and  Science at Denver, could you please help me with booking a flight ticket from DCA to DEN?

ASSISTANT: Ok, can I have your journey dates?

USER: I would like to take off on 04/25 and return on 04/27.

ASSISTANT: Please hold on a minute.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is a connecting flight-1022 on JetBlue airlines. Shall I porceed?

USER: Please confirm the booking if the ticket fare is 500 or less.

ASSISTANT: Ticket has been done with price 100.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Thanks for consulting us.