You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I amend you?

USER: I just want to change my existing reservation, due to sudden changes in my trip.

ASSISTANT: Ok.

USER: Can you hep me out?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Richard Williams is my name.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Thanks for giving your valuable time. There is no reservation done earlier with your name to change.

USER: Ok, I will check. Anyhow thanks for the response.

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