You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation as my trip to New York with my friends has been postpone due to bad health issues. Can you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I am Ryan Gonzalez.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data base.

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

ASSISTANT: Thank you for reaching us.