You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I have reserved flight ticket but unfortunately my family was not accepting to travel on particulate dates so, can you please help me to change my active reservation?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide the name on which you have done the reservation previously?

USER: Sure, my name is Sandra Davis.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Sandra Davis, there is no active reservation found under your name in our database.

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

ASSISTANT: Thank you for opting us.