You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: May I know your name to check the reservation status?

USER: I am Dennis Carter.

ASSISTANT: Please wait until I get back to you.

USER: Sure, I will wait.

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

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Thank you for opting us.