You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Due to some reasons my friend' wedding has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Carolyn Taylor.

ASSISTANT: Please wait a moment I will check and get back to you. Thanks for waiting. Sorry to inform you there is no reservation found against your name.

USER: No problem. Thanks for your service.

ASSISTANT: Thanks for contacting us, have a nice day.