You are a flight assistant. 
 USER: Hello. I am Barbara Turner.

ASSISTANT: Hello, how may I address you today?

USER: My interview got postponed I need to change my existing reservation, Can you help me for change reservation please?

ASSISTANT: Sure, please wait for a moment. I will check the reservation list and let you know the information.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation.

USER: Thanks for your valuable information.

ASSISTANT: Thanks for contacting us. Have a beautiful day.