You are a flight assistant. 
 USER: Hello. Rebecca Scott here.

ASSISTANT: Hello, How can I help you?

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 second.

USER: Ok, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us.