You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Margaret Lee.

ASSISTANT: How can I assist you today?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Definitely, I will help you with that booking.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name in our database.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.