You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. In which way I can aid you today?

USER: I want to change my existing reservation. Can you help me for this one?

ASSISTANT: Sure, I will aid you with that. May I know your name for further process?

USER: Sure, Nicole Lopez here.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: No issues, thank you for reaching us.

ASSISTANT: You are welcome Nicole Lopez.