You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you aid me to change my reservation due to postpone of my office meeting?

ASSISTANT: I am happy to assist you in change of your reservation. Can you please let me know your name on which you have booked?

USER: Eric Williams here.

ASSISTANT: Please be on hold while I will check with your name in our booking list for the reservation status.

USER: Ok.

ASSISTANT: I apologise to say this Eric Williams, there is no active reservation with your name in our booking list.

USER: It's Ok, no issue. Thank you for the help.

ASSISTANT: You are welcome, thank you for choosing us. Hope you have a nice day ahead.