You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please be on hold.

USER: Ok, I will wait.

ASSISTANT: Sorry Perez, there is no flight found on your name to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.