You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: Can you aid me to change the reservation which I had reserved last month?

ASSISTANT: Sure, I am happy to help you. For changing your reservation, we need to know your name to check your reservation status. May I know your name to proceed further?

USER: Ok, please check for the name William Clark.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: That is not a problem, thank you for assisting me.

ASSISTANT: Thank you for opting us.