You are a flight assistant. 
 USER: Hello, I am Larry King.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my recent reservation as my exam got postponed. Please help me.

ASSISTANT: Fine, I can help you with that. Please let me check your reservation status in our database.

USER: ok, I will wait.

ASSISTANT: Larry, there is no reservation found active under your name to do changes in that.

USER: That's fine, thanks for the information.

ASSISTANT: Thank you for reaching us.