You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I already book a reservation but due to my bad health I postpone my journey. Can you change my reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: My name is Ashley white.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name in our data.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.