You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I assist you?

USER: I am Anthony Hill want to change my reservation due to prepone of my exams. Can you help me in changing my reservation?

ASSISTANT: Sure, please be on hold.

USER: Sure.

ASSISTANT: Thanks for holding on, we did not find any reservation with your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks for availing us.