You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Sure, I am Stephen Turner.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for giving your valuable time. There is no active reservation found on Stephen Turner.

USER: That's Ok, not a problem. Thanks for your service.

ASSISTANT: Thank you for availing us.