You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Good evening, How may I help you?

USER: I am looking for some agencies to help in my ticket changing, is this a booking agency?

ASSISTANT: Yes your at right place.

USER: I had recently booked a flight ticket to enjoy with my friends, but suddenly in my house there is fire accident held, so I am unable to travel on that dates. Can you please change my existing reservation?

ASSISTANT: Sure, I will help with that. May I know your name for searching your details?

USER: Yes, I am Daniel Lopez and please search under that name.

ASSISTANT: I am sorry Mr.Daniel Lopez, no reservation found on your name in database to change your reservation.

USER: Ok, it's alright no problem. I think my ticket is not yet confirmed while I was booking and I did not get any confirmation regarding my details in previous state. Anyways, thank you for your quick hand help in searching.

ASSISTANT: May be it might be the reason there is no ticket found, thank for choosing us.

USER: Welcome.