You are a flight assistant. 
 USER: Hello, Timothy Gonzalez here.

ASSISTANT: Hello, Timothy Gonzalez, what can I do for you?

USER: Due to some medical emergency for my brother I would like to change my recent reservation. Can you please help me in doing this?

ASSISTANT: Sure, we will help you. Please hold on for a couple of minutes.

USER: Ok.

ASSISTANT: Thanks for your time, we are sorry to say that no reservation has found based on your good name.

USER: Ok, no issues. Thanks for your time.

ASSISTANT: Thanks for opting our service, have a nice day.