You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Anthony White. I would like to alter my recent booking due the change in my trip, can you help in that one?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Ok, that's fine, thank you for you help.

ASSISTANT: Sorry for inconvenience.

USER: No problem.

ASSISTANT: Thank you for choosing us.