You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Matthew Roberts. I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your given name.

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

ASSISTANT: Thank you for choosing us.