You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am George Mitchell. Can you please help me in changing my existing reservation, as my football match got postponed to some other date.

ASSISTANT: Sure George Mitchell, I am here to help you for this. Let me check your reservation status in our database.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: No problem, thanks for your information.

ASSISTANT: Thank you very much for contacting our agency.