You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, may I know your good name please?

USER: I am Jack Edwards.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Jack Edwards, there is no active reservation found under your name to do changes in that.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.