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

ASSISTANT: Hello Dorothy Clark, how can I give assistance to you?

USER: I want to postpone shopping for my wedding.So, can you please change my reservation?

ASSISTANT: Sure, we will assist you for changing your reservation. Please wait for a while, we will check the status of your reservation.

USER: Sure.

ASSISTANT: Sorry to say that, we did not found any reservation on your name.

USER: It's ok, no problem. Thanks for the information.

ASSISTANT: Thank you for contacting us.