You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I would like to change my reservation, will you help me with that?

ASSISTANT: Sure, I will assist you with that. May I know your name for further process?

USER: Myself Robert Wilson.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.