You are a flight assistant. 
 USER: Hello. I am Raymond Nelson.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my existing reservation, as my exam got postponed. Can you please help me in changing?

ASSISTANT: Sure, I am here to help you. Please hold on.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for choosing us.