You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Amanda Martin.

ASSISTANT: How may I assist you?

USER: Due to emergency work, my plan to visit New York has been postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for availing us.

USER: Thank you for your great information.