You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Do you need any help from our agency?

USER: I am Matthew Hall, want to alter my reservation. Can you please help me?

ASSISTANT: Sure, please allow me a moment.

USER: Ok.

ASSISTANT: I have checked based on your request and it is showing that there is no reservation done previously under this account name.

USER: That's fine, thank you.

ASSISTANT: You are most welcome and have a nice day.