You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to postpone of my project submission dates. Can you please help me with this?

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

USER: Sure.

ASSISTANT: For changing the reservation, may I know your name please?

USER: My name is Susan Thompson.

ASSISTANT: Please wait for a while.

USER: Sure.

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.