Hello.
user
Hello. How can I assist you today?
assistant
Actually my sister's engagement got postponed so that I want to change an existing reservation, can you help me?
user
Sure, I will help you that.
assistant
Ok, sure.
user
Please give me a minute, I will come back with your details. May I know your travelling dates?
assistant
Sure, I am Rebecca Williams. And I want to travel on 07/28 to 07/30.
user
I need your airport codes to proceed the booking?
assistant
My changed airport codes are DFW from LAS.
user
Wait for a moment, I will check  it.
assistant
Make sure that the connection limit is 1. Ok.
user
I did not find any flight with your details.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for your reaching us.
assistant