You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

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

ASSISTANT: Sure, can I know your name?

USER: Thank you. Myself Timothy Turner.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us.