You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My exams are postponed and I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you out. May I know your respected name?

USER: I am Matthew Lewis.

ASSISTANT: Please wait a moment, let me check the reservation on your name.

USER: Ok.

ASSISTANT: Here I found a reservation on your name. Please provide me your new location airport codes?

USER: My airport codes are from DEN to CLT.

ASSISTANT: May I know your travel dates of your trip?

USER: My travel dates are 06/01 and 06/03.

ASSISTANT: Sorry Lewis, no flights available on your new trip details. Do you planned for any other dates?

USER: No problem, I will try in another airlines.

ASSISTANT: Ok, thank you for reaching us.

USER: Thanks for your help.