You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you at this moment?

USER: I need to amend an existing reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you. Sure, please provide your good name to check the reservation in the reservation list.

USER: Thank you. Sure, I am Nancy Lopez here.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure, I will wait.

ASSISTANT: We are sorry to inform you that, we did not find any existing reservation against your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.