You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Myself Lisa Gonzalez, want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Thank you, I will wait for your response.

ASSISTANT: Sorry Lisa Gonzalez, there is no reservation on your name in our database.

USER: That's ok, may be it might went wrong while at the time of booking due to server issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.