You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jacob Martin, I would like to change my recent reservation, can you help me with this?

ASSISTANT: Sure, please give me a moment to check with your details.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's fine, thanks for your help.

ASSISTANT: You are welcome.