You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Could you book my ticket in a connecting flight?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I want to travel from DEN to DCA.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I will travel on Sept 14 and Sept 16.

ASSISTANT: Do you have a preferable timings to travel?

USER: I have no other specifications.

ASSISTANT: Ok, may I know your name?

USER: Dennis Turner here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a connecting flight in Delta Airlines with flight number 1000 having an economy class. Shall I proceed to book?

USER: Please book my ticket.

ASSISTANT: Your booking has been processed.

USER: Thank you for your assistance.

ASSISTANT: Thank you for approaching us.