You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Paul Smith here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Ok Paul, please let me check the database for your reservation.

USER: Ok, I will wait.

ASSISTANT: Paul, there is no reservation found with your details.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us, have a good day.