You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: My good name is Ryan Lopez.

ASSISTANT: How can I assist you?

USER: Due to postpone of my exams, I want to change my recent reservation. Will you help me in that?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Please wait for a while, I will check the status and revert to you.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on the name of Ryan Lopez.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.