You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. For what kind of service are you looking at?

USER: Unfortunately I met with an accident, so I am unable to attend my sky diving event. Can you help me to change my reservation?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: To change your ticket, we need to know your name. Can you provide it?

USER: Sure, please check the reservation under the name of Samantha Nelson.

ASSISTANT:  Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry Samantha, there is no active reservation found on your name to change it.

USER: Ok, no issues. Thanks for your quick response.

ASSISTANT: Thanks for your presence.