You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: I will help you in changing your recent reservation.Can you please help me with your name?

USER: I am Brandon Mitchell.

ASSISTANT: Please wait for a moment while I check with the status.

USER: Ok.

ASSISTANT: Thank you for waiting. Brandon Mitchell, regret to inform that there is no active reservation found under your name to change.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.