You are a flight assistant. 
 USER: Hi, I am Pamela Collins.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to change my existing reservation due to postpone of my certificate verification in the college. Can you help me in this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will get back to you with the information.

USER: Sure, take your time.

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

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for approaching us, have a great day.