You are a flight assistant. 
 USER: Hi. I am Jacob Lewis.

ASSISTANT: Hello, how may I help you?

USER: I have planned for a holiday vacation tour but suddenly the dates got changed, so I would like to change my reservation, can you help me with it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please hold on a moment.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.