You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in changing my reservation which I done last week?

ASSISTANT: May I know your name please?

USER: Myself Raymond Rodriguez.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.