You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I already book a reservation one week ago, now I want to change my reservation as my meeting with client got postponed. Can you help me with that?

ASSISTANT: Sure, please provide me the name to check for the status.

USER: My name is Ryan Collins.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Sure.

ASSISTANT: Thank you for waiting. Here, there is no active reservation have been found under your name in our database to amend it.

USER: Ok, thank you for the information.

ASSISTANT: Sorry for the inconvenience caused, thank you for reaching us with a query.