You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,.

USER: I am Carolyn Williams.

ASSISTANT: How can I serve you?

USER: I am planning to visit Arlington national cemetery hop-on hop-off tour in Washington, DC - IAD. Can you help me to book a connecting flight?

ASSISTANT: Sure, kindly mention your travel dates?

USER: I want to travel on 04/28 and recur on 04/30.

ASSISTANT: May I know your boarding airport code please?

USER: I want to start from Washington DC - DCA.

ASSISTANT: Thanks for your details, I found a connecting flight from Delta airline with flight number 1000 of fare 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your flight ticket has been booked.

USER: Thanks for your response.

ASSISTANT: Thanks for opting us. Have a nice day.