You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Justin Thompson from New York. Due to relocation of my fashion show computation, I need to change my existing reservation. Can you help me to change it?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's Ok, thanks for your time.

ASSISTANT: Thank you for reaching us.