You are a flight assistant. 
 USER: Hello. I am Amy Carter.

ASSISTANT: Hello. How can I address you?

USER: I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no worries at all. Thank you for your information.

ASSISTANT: Thank you for consulting us.