You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My trip got preponed and I need 1 connected flight for my journey, can you please change my existing reservation?

ASSISTANT: Sure, can I know your name?

USER: My name is Jacob Robinson.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: It's ok. Thank you.

ASSISTANT: You're welcome.