You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Stephen Turner. Can you help me to change my reservation?

ASSISTANT: Ok, wait a moment I will revert you back with the proper information.

USER: Sure.

ASSISTANT: Sorry, there is no flight reserved on your name to change it.

USER: No issues, thank you for your information.

ASSISTANT: Welcome Stephen Turner.