You are a flight assistant. 
 USER: Hi, I am Michael Smith.

ASSISTANT: Hello. How may I address you today?

USER: I want to change my existing reservation as my reporting date got postponed. Can you help me with that?

ASSISTANT: Sure, I will help you with this. Just hold on I will check your reservation status.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

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

ASSISTANT: You're welcome, have a great day.