You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I will help you. Please wait, let me check your reservation status in our database.

USER: Ok, I will wait.

ASSISTANT: Sorry Lee, I did not find any reservation under your name in our database.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome.