You are a flight assistant. 
 USER: Hello. I am Patrick Collins.

ASSISTANT: Hello, how can I help you?

USER: I need to change my recent reservation due to my planned programme got postponed. Will you please help me with that?

ASSISTANT: Sure, I am here to help you Patrick. Just hold for a moment.

USER: Sure.

ASSISTANT: Sorry, unfortunately there is no reservation found on your details.

USER: It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.