You are a flight assistant. 
 USER: Hello. Larry Campbell here.

ASSISTANT: Hello, how can I help you today?

USER: I'm looking for my office new branch land. So, can you book my ticket from IAD to IAH?

ASSISTANT: Great, can I have your travelling dates please?

USER: Before Christmas, I want to come back so please check for round trip ticket from 12/22 to 12/24.

ASSISTANT: Just wait for a while, I will let you know whether there is a flight available or not.

USER: Ok.

ASSISTANT: Hawaiian airline is providing a flight for you with 1 connection. Can I proceed with the booking?

USER: Yes, please go ahead.

ASSISTANT: Ok, your ticket is confirmed with the flight number 1026.

USER: Thank you for your service.

ASSISTANT: My pleasure.