You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I need to change my reservation due to my planned programme got postponed so please  help me with that.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Could you please provide your name to check your previous reservation status?

USER: Sure, please check with name Jerry Baker.

ASSISTANT: Sorry to inform you Baker, there is no reservation found with your name in our records.

USER: It's ok fine. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us, have a great day.

USER: Welcome.