You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Jonathan  Miller. I am trying to modify the details. Can you please help me in changing the ticket details?

ASSISTANT: Sure Jonathan Miller, I will help you with that.

USER: Thank you.

ASSISTANT: Please be hold on for a moment to check your reservation status.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry Jonathan Miller, no reservation has found under your name to change.

USER: It's ok, thank you for searching my previous ticket.

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

USER: You are welcome.