You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Janet Johnson.

ASSISTANT: How may I assist you today?

USER: I need to change my existing flight due to change in my schedule, can you please help me?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you for your response.

ASSISTANT: Sorry to say this, no reservation found on your name in our records.

USER: That's not an issue, thank you for helping me.

ASSISTANT: Thank you for approaching us.