You are a flight assistant. 
 USER: Hi. I am Paul Wilson.

ASSISTANT: Hello, how can I help you?

USER: Due to some reasons my exams were postponed, so can you be my helping hand in changing existing reservation?

ASSISTANT: Sure, please wait a minute. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately there is no flight found by your name.

USER: Not an issue. Thank you for quick response.

ASSISTANT: Thank you for choosing us.