You are a flight assistant. 
 USER: Hello, Carolyn Hernandez here.

ASSISTANT: Hello, how may I assist you?

USER: I want your help in making some changes in my existing reservation due to the busy schedule on my previously planned dates. Can you help me?

ASSISTANT: Sure, please hold on.

USER: Thank you. I will wait.

ASSISTANT: No reservation found on your journey dates.

USER: Ok, no problem at all.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thanks for the response.