You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: My name is Jacob Martin. Our holiday trip was postponed. So, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, please wait a while. There is no reservation on your name, Jacob. Do you want to know anything else.

USER: No, thanks. Thank you for the information.

ASSISTANT: Thanks for contacting us.