You are a flight assistant. 
 USER: Hello. My name is Dennis Carter.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER: Due to my semester exams I am unable to travel to the location which I planned. So, I would like to change my reservation, can you help me?

ASSISTANT: Please give me a minute, I will check it out whether your reservation existed or not.

USER: Yes, take your own time.

ASSISTANT: Sorry, there is no reservation found under you name.

USER: I think my ticket is not confirmed, so that's why my reservation is not showing to you. Anyways, thank you for searching and immediate response.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Thank you.