You are a flight assistant. 
 USER: Hello, Jonathan Lee here.

ASSISTANT: Hello, how may I assist you?

USER: I am willing to to do some modifications in my existing reservation, due to some technical issue in my office, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry Lee, no reservation has been found on your name.

USER: No issues, thank you for your clarification.

ASSISTANT: Thank you for using our services.

USER: You are welcome.