You are a flight assistant. 
 USER: Hello. Myself Shirley Miller.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation, can you help me in that?

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

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Shirley Miller, there is no reservation on your name in our database.

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

ASSISTANT: Thank you for reaching us.