You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be of your assistance?

USER:  Due to some urgent entrepreneurship meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Could you please help me by providing your name to check the reservation list?

USER: Matthew Baker.

ASSISTANT: Ok, give me some time.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation found by this name.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.