You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Karen Davis on this end.

ASSISTANT: Nice to meet you Karen.

USER: I would like to change my reservation dates today, due to change in my exam schedule. Can you help me?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Thank you.

ASSISTANT: I have checked with your details Karen. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, that's very sad news for me. Anyways, thank you for checking with my previous booking.

ASSISTANT: Thank you.

USER: Thank you for your humble assistance.