You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change an existing reservation due to my exams got post pone. Can you please check the reservation with the name Charles Rodriguez?

ASSISTANT: Sure, I will. Please hold on.

USER: Sure.

ASSISTANT: Thanks for being patience. Sorry, there is no reservation found in your name.

USER: Ok thanks for your help.

ASSISTANT: Thanks for reaching us.