You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Edwards Davis, want to alter my reservation dates. Can you please help me?

ASSISTANT: Please wait a moment let me check.

USER: Ok.

ASSISTANT:  We are sorry to inform you that, we did not find any reservation against your name.

USER: It's ok, thank you.

ASSISTANT: Thanks for consulting us.