You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Collins.

ASSISTANT: What service that you are looking from our agency Donna Collins?

USER: I am planning to visit Houston, can you please book me a ticket from DFW to IAH?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your planned dates of travelling?

USER: My preferable journey dates are from 09/26 to 09/28.

ASSISTANT: Please wait a moment to check the flights availability in your route and I will get back to you with a best flight from our service.

USER: Sure, take your own time.

ASSISTANT: Based on your travel details, I have found a flight with a single connection with a fare of 100 from Southwest airlines. If you are ok with this, please inform me to book the flight.

USER: Please reserve my ticket with this airlines.

ASSISTANT: Ok, your ticket has been confirmed in flight number 1029.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for reaching to our services, hope you have a great journey.