You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my reservation as my plan to visit Washington is postponed. Can you help me with that?

ASSISTANT: Sure, I will help you. May I know your name to proceed further?

USER: My name is Sandra Phillips.

ASSISTANT: Please wait for a while, I will check in the reservation list and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.