You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation, can you help me in that?

ASSISTANT: Sure, may I know your name?

USER: I am Edward Phillips.

ASSISTANT: Wait a minute. Sorry, we could not find any reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.