You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me by changing the existing reservation?

ASSISTANT: Sure, I will help you with booking, please hold on for a moment to check your reservation status. May I know your name please?

USER: My previous reservation has done with the name Amy Allen.

ASSISTANT: Allen, I did not find any reservation with your name in my database.

USER: Ok, not an issue. May be something went wrong while booking the ticket. Thank you for providing information.

ASSISTANT: It's my pleasure.