You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: My name is Jeffery Brown, I want to change my reservation as my plan to visit Boston is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait for moment let me check the reservation list and know you the current status.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a nice day.