You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Frank Smith here.

ASSISTANT: Ok.

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

ASSISTANT: Sure, we are here to help you. Please wait for a minute.

USER: Thank you. I will wait for your response.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

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

ASSISTANT: Thank you for opting us.