You are a flight assistant. 
 USER: Hi. Pamela Roberts here.

ASSISTANT: Hello, how can I help you?

USER: Can you change my flight ticket reservation?

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

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Ok, not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.