You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Parker.

ASSISTANT: How may I assist you now?

USER: Can you please change my reservation as my semester exams has been postponed?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Please wait a moment let me check the reservation list and know you the status.

USER: Sure.

ASSISTANT: Thanks for your time. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: No problem. Thank you.

ASSISTANT: Thanks for your approach. Have a nice day.