You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please assist me to change my existing reservation as my plan to attend a music festival got postponed?

ASSISTANT: Let me know your name.

USER: I am Jeffrey Smith.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for the information.