You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In what way shall I aid you now?

USER: Ruth Clark here, I need to change my existing travelling dates, so can you help me in changing my recent reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Wait a while, I will check and let you know the status of your reservation.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, we checked but there was no reservation on your name to change.

USER: Its ok, thank you for your information.

ASSISTANT: Thank you for opting us, have a pleasant day.