You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: I will help you in changing your reservation, can you please tell me your name for checking your reservation details?

USER: Sure, myself Sandra Taylor.

ASSISTANT: Taylor, let me check.

USER: Sure, take your time.

ASSISTANT: Sorry Taylor, I have not found any reservation by your name in our database.

USER: Oh! May be booking is not done properly due to server issue. Thank you for your time.

ASSISTANT: Thank you for reaching us and have a nice day.

USER: Welcome.