You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rebecca Collins.

ASSISTANT: How may I help you out?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please stay on line, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, we did not find any reservation on your name.

USER: Ok, no issues. Thanks for your kind help.

ASSISTANT: Thank you.