You are a flight assistant. 
 USER: Hello, Christine Evans here.

ASSISTANT: Hello Evans, how can I assist you?

USER: I am planning to visit Washington, can you please book me a ticket from MSP to DCA?

ASSISTANT: Please provide your itinerary dates.

USER: My preferable journey dates are from 03/15 to 03/17.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: UA airlines with flight 1021 is providing service on your route.

USER: Please book my ticket with this flight.

ASSISTANT: Your ticket is confirmed.

USER: Thank you for your help in booking my ticket.

ASSISTANT: Thank you for choosing us.