You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, we are here to help you. Can I have your name to proceed further?

USER: I am Brian Robinson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.