You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to re-change my travelling dates of active reservation which was reserved last week, can you please aid me to change my reservation?

ASSISTANT: Sure, can you give me your name for checking?

USER: Well, it was reserved on the name of Jerry Collins.

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

USER: Ok, thank you for notifying me.

ASSISTANT: Thank you for reaching us.