You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Ok, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My previous reservation has done with the name Laura Nelson.

ASSISTANT: Ok, not an problem. Please wait for a minute.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry to say that, there is no reservation found in our database.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.