You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Jacob Miller from San Francisco. I want to change my travel dates in my previous reservation, can you please help me with that?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please give me a minute.

USER: Ok.

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

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.