You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Hall.

ASSISTANT: How may I help you?

USER: Can you please help me in booking my flight ticket from DEN to IAH?

ASSISTANT: Ok, on which dates you are willing to travel?

USER: Ok, my travelling dates are 12/19 and 12/21.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: I got a connecting flight-1029 with price 100 of UA airline.

USER: Ok, please proceed.

ASSISTANT: Ok, your ticket has been done.

USER: Ok, thank you for your help.

ASSISTANT: Thanks for contacting us.