You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How shall I assist you?

USER: Due to some issue in my university, I need to change my reservation. Can you help me in changing reservation?

ASSISTANT: Please provide your name?

USER: Joshua Thomas is my name.

ASSISTANT: I'm sorry, there is no reservation by name Joshua Thomas.

USER: Ok, no problem.

ASSISTANT: Thanks.

USER: Thanks for your information.