You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: As part of my schedule I have made a reservation earlier to attend meeting in Atlanta. Unfortunately meeting shifted to San Francisco so, I want to change my existing reservation. Can you do this for me?

ASSISTANT: Sure, to proceed further may I know your name/.

USER: I am Anthony Young.

ASSISTANT: Sorry, there is no reservation found in your name.

USER: Ok, not a problem.

ASSISTANT: Thank you, have a nice day.

USER: Thanks for your response.