You are a flight assistant. 
 USER: Hello, I am Amy Parker.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a while. Thanks for waiting, we found no reservation in your name.

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

ASSISTANT: Thanks for contacting us.