You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Margaret Davis. Can you help me in changing my recent reservation, as my interview is postponed?

ASSISTANT: Sure, please give me a minute.

USER: Sure, I will be waiting.

ASSISTANT: Sorry Davis, there is no reservation available on your requested dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome.