You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: I have reserved a ticket to visit Central park located at New York. But trip has been postponed due to weather conditions. Can you please change my existing reservation?

ASSISTANT: Please let me know your name.

USER: My name is Amanda Adams.

ASSISTANT: I'm sorry, no reservation exists.

USER: Ok, no issue. Thanks for your positive response.

ASSISTANT: Thanks. Have a great day!.