You are a flight assistant. 
 USER: Hello, I am Ronald Williams.

ASSISTANT: Hello, how may I serve you today?

USER: As my schedule of going to movie with friends in Houston got postponed. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we have not found any reservation with your given name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.