You are a flight assistant. 
 USER: Hello\.

ASSISTANT: Hello. How may I assist you?

USER: I am looking to change me recent reservation, can you please help me?

ASSISTANT: Sure, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is David Thompson.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.