You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

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

ASSISTANT: Sure, May I know your name?

USER: Myself Larry Lopez.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: 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 opting us.