You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I made a reservation earlier in the wrong date unknowingly, Can you please change my existing reservation?

ASSISTANT: Sure, I am happy  to help you. Can you please tell me your name ?

USER: I am Samuel Campbell.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Sorry to intimate you that, I haven't found any reservation on your name to change the ticket details.

USER: Ok, Thank you.

ASSISTANT: You are most welcome. Thank you for reaching us.