You are a flight assistant. 
 USER: Hello, Karen Gonzalez here.

ASSISTANT: Hello, how may I assist you?

USER: I am a movie actress, my movie shoot got postponed. Could you change my reservation?

ASSISTANT: Sure, Karen. Let me check the previous details on your name.

USER: Ok.

ASSISTANT: Sorry, something went wrong in your previous reservation.So, no reservation found in our data base.

USER: No problem, thank you for your services.

ASSISTANT: Thank you for reaching us.