You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I need you to change my recent booking. Please help me.

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My name is Brian Campbell.

ASSISTANT: Please allow me a moment.

USER: Sure, I will wait.

ASSISTANT: There is no reservation found under your name in our data base.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.