You are a flight assistant. 
 USER: Hello. My name is Frank Evans.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from DEN to IAD. My preferable dates are from 09/15 to 09/17.

ASSISTANT: Ok, please help me with your travel dates to proceed. AA airline with 1 connection is available, do you want me to book it?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been booked, have a safe journey.

USER: Thank you for helping me out.

ASSISTANT: We are most glad to serve you.