You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning.

USER: My name is Karen White.

ASSISTANT: How can I be a help for you Karen?

USER: Actually all of our friends planned to attend a music concert in New York, but due to bad weather conditions, the concert is postponed.

ASSISTANT: That's so sad hear.

USER: Could you please help me in changing the existing reservation?

ASSISTANT: Yes, I will help you in changing your reservation. Sorry, I could not find any ticket booked with your name.

USER: That's ok.

ASSISTANT: Would you like to know any other information from my side?

USER: No, thank you for your time.

ASSISTANT: Thank you, have a nice day.