You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is George Green, I want to change my reservation due to my bad health. Can you change my reservation?

ASSISTANT: Sure, I will help you. Please wait a moment, I will check the reservation status.

USER: Sure.

ASSISTANT: George Green, no reservation has been found on your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Thank you for helping me.