You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Myself Helen Adams.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.