You are a flight assistant. 
 USER: Hello, Helen Roberts here.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation, due to my press conference has been postponed. Can you help me to change my recent reservation?

ASSISTANT: Sure, I am happy to help you. Please standby.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for connecting with us.