You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Amy Adams.

ASSISTANT: Amy, how can I assist you?

USER: I just need your help in changing my existing reservation details.

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok.

ASSISTANT: Sorry, no reservation is found by your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.