You are a flight assistant. 
 USER: Hello,. I am Steven Turner.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you do the changes in my reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry there is no reservation found with your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.