You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How may I help you today?

USER: My college seminar has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Yes sure.

USER: Thank you.

ASSISTANT: Please give me a moment to check your details in my database. May I know your name?

USER: My name is Elizabeth Allen.

ASSISTANT: No reservation found on your details.

USER: No problem, I will check another flight.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Welcome.