You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jennifer Gonzalez. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.