You are a flight assistant. 
 USER: Hi. Paul Lee here.

ASSISTANT: Hello. How may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say you that there is no reservation found under your name in our database.

USER: Not a problem.

ASSISTANT: You are most welcome.

USER: Thank you.