You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

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

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

USER: Richard Johnson.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.