You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you for today?

USER: Myself Mary Nelson, can you help me to change my existing reservation which my cousin had done?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok, please take your time.

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

USER: Ok, thank you for searching your records.

ASSISTANT: Thank you for reaching us, have a nice day.