You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: My meeting with client has been postponed, can you please help me to change my existing reservation?

ASSISTANT: Sure, I will help you with the change of flight reservation. May I know your name please?

USER: Yes, I am Jacob Lopez.

ASSISTANT: Please wait for a moment. I will check with your details and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that there is no reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for approaching to us.

USER: Thank you for your information.