You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to modify the return journey date in the flight ticket which is booked previously because I have planned for the trip for some more days. Can you please help me to change the details?

ASSISTANT: Sure, I am happy to help you to change the ticket details. May I know your name please?

USER: Thank you. I am Jonathan Green.

ASSISTANT: Ok, please give me a minute. I will check your ticket status and let you know the information.

USER: Sure, I will wait for your response.

ASSISTANT: I regret to inform you that, there is no active reservation found with your name in our database to change the details.

USER: Ok, not an problem. Thank you for  your information.

ASSISTANT: You are welcome. Thank you for choosing us.