You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Olympic National Park at Washington, could you please help me with booking a flight ticket from IAD to DCA?

ASSISTANT: Can you give me your trip dates?

USER: I would like to depart on May 31st and return on June 2nd.

ASSISTANT: Do you need any connections?

USER: I am looking for a connecting flight.

ASSISTANT: Are there any other preferences?

USER: I have no other preferences.

ASSISTANT: May I know your name?

USER: I am Dennis Harris.

ASSISTANT: Connecting flight number 1026 with price 100 in economy class is available. Is it ok?

USER: Please confirm the booking.

ASSISTANT: Your ticket has been booked.

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

ASSISTANT: Thank you for reaching us.