You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER:  I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me to change it?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Dennis Turner.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

USER: Ok, thank you.

ASSISTANT: Thank you for availing us.