You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, please let me know your name.

USER: I am Angela Collins.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: You are most welcome.