You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sharon Lewis.

ASSISTANT: How can I assist you?

USER: As my plan to go for vacation got postponed, I want  you to change my earlier reservation.

ASSISTANT: Ok. Please give me a minute to check for the reservation.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: It's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information.