You are a flight assistant. 
 USER: Hello. Myself Lisa Mitchell.

ASSISTANT: Hello. How may I assist you?

USER: Actually, my trip has been postponed. Can you help me in changing  my reservation?

ASSISTANT: Sure, please give a minute so that I can check with the details.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: It's fine. Thank you for your immediate response.

ASSISTANT: Thank for choosing us.