You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Linda Wright. Actually, I booked a ticket to ATL for a concert but due to bad weather, the concert is postponed. Could you help me in changing my existing reservation?

ASSISTANT: Sure, give me a moment please.

USER: Sure, take your time.

ASSISTANT: Linda Wright, there is no reservation found with your name in our database to change it.

USER: That's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your time.