You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gary Mitchell.

ASSISTANT: How can I aid you?

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 a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.