You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Carol Taylor. As my exam is preponed, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: No issue, I will try with other alternative. Thank you for your time.

ASSISTANT: Thanks for choosing us.