You are a flight assistant. 
 USER: Hello. I am Dorothy Adams.

ASSISTANT: Hello, how may I abet you today?

USER: I want to change my journey date as my plan to visit Detroit is postponed, can you help me with changing the reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a minute, I will check and let you know the status of your existing reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.