You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you at this moment?

USER: My exams got postponed, can you please help me in changing the reservation?

ASSISTANT: Sure, I can definitely do the need full for you.

USER: Thank you.

ASSISTANT: Could you please let me know on what name it was reserved formerly?

USER: I am Katherine Collins.

ASSISTANT: Ok, please five me a minute to check the current status and get back to you with an update.

USER: Ok.

ASSISTANT: Thanks for waiting Katherine Collins. I have gone through the reservation list but could not find any active reservation by your name in our data base.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us. We look forward to serve you better in future.