You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What assistance do you expect from our flight ticket booking agency?

USER: Myself Raymond Green, can you help me to change my travel dates of my recent reservation?

ASSISTANT: Sure, I am here to help you with that. Can you please hold on for a minute?

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting.

USER: That is ok.

ASSISTANT: I am very sorry to inform you Raymond Green, I have not found any active reservation with the your details in our database.

USER: Ok, thank you for assisting me.

ASSISTANT: My pleasure, thank you for choosing our flight ticket booking agency. Have a nice day.