You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my recent reservation due to some issues, can you help me in doing that?

ASSISTANT: Sure, may I know your name for the changing process?

USER: I am Brian Walker.

ASSISTANT: Thank you, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, we couldn't find a reservation on your name to change.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.