You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Lewis here.

ASSISTANT: How may I assist you?

USER: Can you please help me in changing my recent reservation? As my planned trip has been changed to some other dates.

ASSISTANT: Sure, I will help you with that. Please hold on a minute, I will revert you back with the current status of your reservation.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation found on your name to change it.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thanks for opting us, have a nice day.