You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am willing to visit the art gallery in PHX but I can not got now so I want to change my travel dates. Can you amend my reservation? My name is Brandon Evans.

ASSISTANT: Sure, wait a moment I will check your reservation. Thanks for your time, there is no reservation found under your name to change it.

USER: That's ok, thank you for assisting me.

ASSISTANT: Thanks for contacting us.