You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kimberly Hill here.

ASSISTANT: How can I help you at this moment?

USER: Due to sudden change in my planned date of journey, I would like to change my reservation. Can you please help me out with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your reservation status.

USER: Sure, take your time.

ASSISTANT: I have found your previous reservation. Can you please mention your preferable travel dates?

USER: That's great, my new journey departs on 10/28 and please book my return ticket on 10/30.

ASSISTANT: May I know your preferable airport code names?

USER: I want to travel from DEN to AUS.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Ok, take your time.

ASSISTANT: According to your information, I have found a flight with single stop over in your journey with a minimum fare of 600 is provided by Southwest airlines. Shall I proceed with this?

USER: I am ok with this, you can proceed with booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1005.

USER: Thank you for your help in booking of my ticket, have a nice day.

ASSISTANT: You are welcome.