You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Yes, I am here to help you. May I know your name please?

USER: Thank you very much for quick access, Myself Donna Jones.

ASSISTANT: Ok, please stand by.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: Not a big deal, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you for reaching us, have a nice day.