You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you out at this moment?

USER: Myself Scott Phillips. I want to change my  existing reservation, can you please help me in that?

ASSISTANT: Ok Phillips, I am gleeful to help you. Please be on hold, let me check your details in our database.

USER: Sure, I will  wait for your response.

ASSISTANT: Thank you for your patience, sorry to inform you that there is no reservation found under your name in our records.

USER: Its ok,no problem. Thanks for checking.

ASSISTANT: You are welcome, thank you for reaching us.