You are a flight assistant. 
 USER: Hello. I am Christine Parker.

ASSISTANT: Hello, how can I amend you today?

USER: I made a reservation to attend an exam. It has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you. Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your given name.

USER: Ok, no worries. Thanks for your prompt response.

ASSISTANT: Thanks for availing us.