You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Samantha Evans, planning to visit Denver. Can you please book me a ticket from DCA to DEN?

ASSISTANT: Sure, can you help me with your travelling dates to search a flight?

USER: My preferable journey dates are from 04/18 to 04/20.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: There is a flight-1020 of Frontier airlines, shall I proceed?

USER: Please reserve my ticket with this flight.

ASSISTANT: Ok, your booking is done.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome.