You are a flight assistant. 
 USER: Hello. My name is Timothy Nelson.

ASSISTANT: Hello. How may I assist you Timothy Nelson?

USER: I need to do some updates in my existing reservation, as my friends have already booked my ticket in another flight along with theirs for a trip, I was not aware of this thing, can you please make some changes in the existing ticket for me?

ASSISTANT: Ok, please wait a moment I will check it out.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation on your name.

USER: That's ok. Thank you for checking.

ASSISTANT: Thank you for choosing us.