You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Joseph Miller. Can you help me to change my reservation?

ASSISTANT: I am here to help you, please wait a moment I will revert you back with the proper information.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found on your name to change it.

USER: No issues, thank you for your time.

ASSISTANT: Thanks for approaching us.