You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, I am here to help you. Can you please share your name to check your previous reservation status?

USER: Dennis Hall here.

ASSISTANT: Ok, please give me a moment. Sorry, there is no reservation found on your name in our records.

USER: No issue, Thank you.

ASSISTANT: Thank you for reaching us.