You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for today?

USER: Can you please help me to change my reservation on the name of James Thomas?

ASSISTANT: I am here to help you in changing your reservation James Thomas but please be on hold for a while to check the active reservation with your name.

USER: Sure.

ASSISTANT: I regret to say this James Thomas, there is no active reservation with your name in our booking list to change.

USER: No issues, thank you.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.