You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you today?

USER: Due to an emergency work, I want to change my existing reservation. Please help me.

ASSISTANT: Ok. May I know your name for checking the reservation?

USER: Linda Parker here.

ASSISTANT: Sorry, there is no reservation found with your name Linda Parker.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for the information.