You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my existing reservation due to postpone of my event. Can you please help me?

ASSISTANT: Sure, I am here to help you with this.

USER: I am Frank King.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Frank King, there is no active reservation found under your name in our database.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for contacting us.