You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nancy Evans here.

ASSISTANT: How may I aid you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait a moment, let me check.

USER: Ok, I will wait.

ASSISTANT: Sorry Evans, there are no active reservations found on your details.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting our service.