You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello. How may I assist you today?

USER: I want to reschedule my trip dates as my plan to go for shopping got postponed. Can you help me in updating my existing reservation?

ASSISTANT: Sure, I will help you. Just a moment I will check and let you know.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found by this name.

USER: That's Ok.

ASSISTANT: Thank you for opting us.

USER: Thanks for your assistance.