You are a flight assistant. 
 USER: Hi, I am Jeffery Lee.

ASSISTANT: Hello, how may I be of your help?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.

ASSISTANT: Sure, give me sometime to check and get back to you. Thank you for waiting. There is no reservation found according to your name.

USER: Ok, no prob elm. Thanks for your information.

ASSISTANT: Than you for choosing us.