You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Jack Perez. I need to change my existing reservation, could you help me?

ASSISTANT: Sure, I am here to help you. Please give me a minute, I will check the status and revert to you.

USER: Thank you.

ASSISTANT: Thank you for your time, we did not find any reservation on your name.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.