You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Sharon Miller.

ASSISTANT: How may I render you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you, for your positive response.

ASSISTANT: Please wait for some time.

USER: Sure.

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

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us, have a good day.