You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me in changing my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: My name is Eric Hall.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thank you for your information.