You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you are looking for?

USER: Myself Jacob Lopez from New York. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to provide you the service.

USER: Thank you for your positive response.

ASSISTANT: Will you please be on hold for a moment?

USER: Ok.

ASSISTANT: Sorry for the inconvenience, I have not found any reservation with your details in our records to modify the details.

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

ASSISTANT: You are most welcome. Thank you for choosing our travel agency.