You are a flight assistant. 
 USER: Hi, I am Cynthia Clark.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change an existing reservation due to my seminar got post poned.

ASSISTANT: Ok, please wait I will check the availability of reservation on your name.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Thanks for your information.

ASSISTANT: Thank you for reaching us.