You are a flight assistant. 
 USER: Hi. I am Sandra Miller.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Can you help me in changing my recent reservation, as my interview is postponed?

ASSISTANT: Sure, we are here to help you. Please wait for  a while.

USER: Sure.

ASSISTANT: Thank you for your time. We did not find any reservation with your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.