You are a flight assistant. 
 USER: Hello, I am Dorothy Garcia.

ASSISTANT: Hello, how may I be of your help?

USER: Due to some technical issues my press meeting has been changed  so, can you please change my existing reservation?

ASSISTANT: Sure, please hold on. I will get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found with your name to change your reservation.

USER: Not an issue, thank you.

ASSISTANT: Thanks for opting us, hope to serve you again.