You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to an emergency, my trip got postponed. Could you please help me in changing the reservation?

ASSISTANT: Sure, can I know your name for checking the details.

USER: My name is Linda Phillips.

ASSISTANT: Sorry Linda, I couldn't find any reservation with your details.

USER: That's ok. Thank you for your information.

ASSISTANT: You are welcome. Have a nice day.