You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Taylor.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: There is no reservation found under your name to do changes in that.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.