You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you at this minute?

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, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can I know your name?

USER: I am Rebecca Johnson.

ASSISTANT: We are regret to say that, there is no reservation found on your name in our database.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.