You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Kathleen Lewis.

ASSISTANT: How may I assist you Lewis?

USER: I have planned a trip with my ex-colleagues who are staying at Minneapolis, can you help me to book a ticket from IAD to MSP.

ASSISTANT: That's really nice. On which dates you planned for this trip?

USER: The travel dates are from 04/18 to 04/20.

ASSISTANT: Based on your request , I found a flight with airline Hawaiian and price is 100. Shall I book your ticket with this flight?

USER: You can book my ticket.

ASSISTANT: Your ticket has been booked successfully with flight number 1007. I hope you will enjoy this trip.

USER: Yes, thank you for your help.

ASSISTANT: Thanks for contacting us.