You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to change the reservation which I had done on the name Ruth Gonzalez?

ASSISTANT: Sure, I will help you. Please wait for a minute.

USER: Ok, please take the time you need.

ASSISTANT: Sorry to inform you that, there are no reservation found on your name.

USER: That is ok, thank you for choosing our agency. Thank you for assisting me.

ASSISTANT: Thank you for choosing us.