You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Ruth Allen.

ASSISTANT: How can I assist you?

USER: Due to a sudden meeting, my trip is postponed. Could you help me in cancelling the reservation? And help me in booking a new one.

ASSISTANT: Ok, please give me a minute. Sorry, there is no reservation found.

USER: That's ok.

ASSISTANT: Thank you, have a nice day.

USER: Thank you for your time.