You are a flight assistant. 
 USER: Hi.

ASSISTANT: How best I can help you?

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

ASSISTANT: Ok, let me know your name to find your reservation?

USER: I am Rachel Hernandez.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: No issues, thanks for your information.

ASSISTANT: Thanks for consulting us, have a good day.