You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: My exam has been postponed due to some issues. Can you please change my existing reservation?

ASSISTANT: Sure, please let me know your name?

USER: My name is Amy Lewis.

ASSISTANT: Ok, wait for a moment, I will check the reservation list and let you know the information.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, it's not a problem. Thanks for your response.

ASSISTANT: Thanks for availing us.