You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

USER: I am Lisa Gonzalez. Due to some health problems, I want to change my recent reservation. Can you please help me with that?

ASSISTANT: Sure please wait, I will check and inform you.

USER: Sure. I will wait for your response.

ASSISTANT: Thanks for waiting, No reservation found with your name.