You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I address you today?

USER: Can you help me change my existing reservation which was made on the name of Jacob Thomas?

ASSISTANT: Ok, just a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation on this name.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for opting us.