You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Lopez here.

ASSISTANT: How can I assist you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Ok, please wait.

USER: Thank you for considering my request, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.