You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to alter my existing reservation because my project work is not yet finished. Can you help me?

ASSISTANT: Sure, can I have your name please?

USER: Yes, my name is Kimberly Hill.

ASSISTANT: Please wait a minute, I will check your reservation is existing or not.

USER: Sure. Carry on.

ASSISTANT: Hill, there is no reservation found under your name to do modifications.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us.