You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you today?

USER: I have some personal matters that need fixing so I need to change an an existing reservation. Can you please help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check in the reservation list?

USER: My name is Joshua Harris.

ASSISTANT: Please be on hold, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for holding on, there is no reservation found on your specified name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for approaching us, hope to serve you again.