You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I just want to change an existing reservation as my plan to meet my old friend got postpone due to some technical issues. Can you please check the reservation by the name Steven Collins?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: That's ok, thank you for your information.

ASSISTANT: Thanks for contacting us.