You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Mary Jones.

ASSISTANT: Hello Mary.

USER: As my relatives arrived at my home suddenly, I want to postpone my plan to go Austin. Will you please help me in changing my reservation?

ASSISTANT: Sure, wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: Sorry Mary, there is no reservation found under your name in our database?

USER: That's ok, thank you for your time.

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

USER: Thank you.