You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Shirley Phillips. I have to change my flight ticket reservation due to some problems in my home town, can you please help me in changing my flight ticket booking?

ASSISTANT: Ok, wait a moment. Sorry, there is no reservation found on your name in our database.

USER: Ok, that's fine. Thank you for your quick information.

ASSISTANT: Thanks for choosing us, have a good day.