You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, could you please tell me for what service you reached us?

USER: Due to change in my plan to visit Boston, can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Could you please tell me on what name you reserved a plane ticket previously?

USER: My previous reservation has done with the name of Richard Jackson.

ASSISTANT: Ok, please wait for a while it may take few minutes.

USER: Sure.

ASSISTANT: Jackson, I haven't found your previous reservation in our portal to change further.

USER: Ok, no issues. May be my friend has already changed my reservation on behalf of me.

ASSISTANT: Do you need any other assistance, I am glad to help you?

USER: No, thank you for providing information.

ASSISTANT: Thank you for connecting with us.

USER: Welcome.