You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: I am here to help you, may I know your travel dates?

USER: I would like to depart on Feb 14th and return on Feb 16th.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: Make sure that my depart time must be morning.

ASSISTANT: There is a connecting flight-1008 in economy class, is it ok for you?

USER: Yes, please confirm the booking.

ASSISTANT: Your ticket has been done on Spirit airlines.

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

ASSISTANT: Thanks for choosing us.