You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I give assistance to you?

USER: I booked a ticket to New York to visit Statue of Liberty, now my plan is postponed. Can you help me to change my reservation with new dates?

ASSISTANT: Sure, may I know name, please?

USER: My name is Matthew Campbell.

ASSISTANT: Sorry, Matthew Campbell we could not found any reservation to change.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.