You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation due to my planned event got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: Sure, myself Nicole Lewis.

ASSISTANT: Nicole, there is no reservation found with your details.

USER: Oh! It may not be booked properly due to server issue. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.