You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Alexander Clark here. I would like to change my reservation as my exams postponed to some other dates, can you please help me with that?

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you.