You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what type of help you are looking from our service?

USER: There is an emergency case which came to hearing on the dates which I have planned to enjoy in my holidays, so I am unable to travel the trip due to this one. Can you please help me in changing my flight ticket?

ASSISTANT: I feel euphoric to help you about your flight ticket modification.

USER: Thank you.

ASSISTANT: Please hold for sometime, can you please provide your name to check the active reservations under your name?

USER: Sure, I am David Parker.

ASSISTANT: I regret to say this David, I am not able to find any active reservations under your name.

USER: Ok, that's fine. I think it is not booked properly while I am booking. Thank you for your help.

ASSISTANT: Most welcome, thank you for reaching out here David.

USER: Welcome.