Hello.
user
Hello. How can I help you?
assistant
I have planned for a trip, but it is postponed due to some reasons. Can you please help me to change the existing reservation?
user
Sure, may I know your name please?
assistant
My name is Frank Campbell.
user
Thank you for providing your details, there is no reservation with your requirements.
assistant
That's ok, thank you for the information.
user
You are welcome.
assistant