You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Emily Edwards, I want to change my reservation as my plan to visit New York is postponed. Can you change my reservation with new dates?

ASSISTANT: Sure, we are glad to assist you to change your reservation. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any reservation registered with us in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing our service.