You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I have to change my travelling dates in my previous reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, please mention your name for checking the reservation status.

USER: Ok, I am Deborah Nelson.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.