You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Anthony Collins here, due to bad weather my exams got preponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, Please hold on for a minute.

USER: Ok.

ASSISTANT: Thanks for holding on. We did not find any recent reservation with the name of Anthony Collins.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for approaching us with an enquiry.