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

ASSISTANT: Hello, how can I assist you today?

USER: Can you Please change my existing reservation? As my planned trip has been postponed.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Oh! May be I made a wrong reservation, anyways thank you.

ASSISTANT: Thank you for reaching us.