You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Stephanie Carter here. My friends suddenly changed the trip plan.So I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, Carter. Please wait for a while.

USER: Ok.

ASSISTANT: There is no reservation details of you in our database, Carter.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for using our service.