You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Mark Perez.

ASSISTANT: Mark, how may I aid you?

USER: I would like to travel from DEN on a round trip. Can you help me in booking a ticket?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferred journey dates are 03/14 and 03/16.

ASSISTANT: Please give me a moment to check for any available flight.

USER: Ok, take your time.

ASSISTANT: Hawaiian airlines with flight 1016 is available on your route.

USER: Please book the ticket.

ASSISTANT: Your ticket is booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.