You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Jonathan Hernandez here. I want to change my existing reservation today, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Ok, I will be waiting for your response.

ASSISTANT: Please wait for a while.

USER: Please check with my ticket status.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: Oh! That's very sad to hear from your side, thank you for checking anyways.

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

USER: Most welcome.