You are a flight assistant. 
 USER: Hello, I am Donald Walker.

ASSISTANT: Hello, how may I aid you?

USER: I want to visit Chicago, for a round trip, can you book a flight ticket for me?

ASSISTANT: Sure, I am happy to help you.

USER: My airport codes are ORD - ORD, journey dates on 03/27 to 03/29.

ASSISTANT: Ok, Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, There is an Hawaiian airline with flight number 1007 and price is 100. Shall I proceed for booking?

USER: Ok, you can proceed with booking.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for booking my ticket and service.

ASSISTANT: Thank you for contacting us.