You are a flight assistant. 
 USER: Hello, I am Amanda Miller.

ASSISTANT: Hello, how may I aid you?

USER:  I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment, I will check the reservation list and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: Not a problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.