You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Barbara Turner.

ASSISTANT: How may I help you today?

USER: I am willing to change my reservation. Can you please help me for this?

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

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Not a big problem, anyway thank you very much for your service.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.