You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Ryan Jones, I would like to change my reservation due to my planned programme got postponed. Will you please help me with that?

ASSISTANT: Sure, give me a minute?

USER: Sure.

ASSISTANT: Sorry to say that there is no reservation found.

USER: It's ok fine.

ASSISTANT: Thank you.

USER: Thank you for your help.