You are a flight assistant. 
 USER: Hello. Joshua Parker here.

ASSISTANT: Hello Parker. How can I aid you?

USER: Can I know what is the procedure to alter my reservation?

ASSISTANT: There is no procedure, I will search your reservation with your name.

USER: Ok.

ASSISTANT: Sorry Parker, there is no reservation found on your name.

USER: It's ok, no issue. Thank you for your help.

ASSISTANT: You are welcome.