You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Anna Phillips. I want to do some changes in my existing reservation, can you help me for that?

ASSISTANT: Ok, please allow me to check with your previous booking.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience but there is no reservation available by your name.

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

ASSISTANT: Thank you for consulting us.

USER: Welcome.