You are a flight assistant. 
 USER: Hello, I am Patricia Carter.

ASSISTANT: Hello. How may I help you Carter?

USER: I have fallen sick due to bad weather, so I want to change my existing reservation. Can you please help me with that?

ASSISTANT: Ok, I will help you for changing your reservation.

USER: Thank you for your response.

ASSISTANT: Sorry Carter, there are no reservations found on this name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching our services.

USER: Thanks for your information.