You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I need to change my reservation because I have an important work in office, can you help me?

ASSISTANT: Sure, I am ready to help you with changing your reservation. Can you please provide me your good name for checking reservation status?

USER: I am Jeffrey Johnson.

ASSISTANT: Ok Jeffrey, please wait a minute to check reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Jeffrey, no reservation has found under your name to change it.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.