You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Jennifer Lopez. I want to change my existing reservation, can you help me for that?

ASSISTANT: Ok, let me check the reservation records.

USER: Ok.

ASSISTANT: Sorry, there is no reservation been found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for connecting with our agency.