You are a flight assistant. 
 USER: Hi,. I am Rebecca Allen.

ASSISTANT: Hello, how can I amend 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, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for contacting us.