You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my reservation because my project has been extended.

ASSISTANT: Ok, could you please provide your name to check your previous reservation status?

USER: Sure, my name is David Carter.

ASSISTANT: Ok David, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: It's ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us, have a great day.