You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation, due to my trip with my friends has been postponed. Can you please aid me to change it?

ASSISTANT: Sure, can you please provide your name?

USER: Sure, Anthony Young is my name.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for reaching us.