You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Can you help me to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, may I know your name to check the previous reservation status?

USER: I am Sandra King.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.