You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a ticket from DTW to PHX?

ASSISTANT: Sure, can you share your trip dates?

USER: Can you help me to book for the dates Oct 10th and Oct 12th?

ASSISTANT: May I know your name?

USER: Ok, please book in the name Brian Parker.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That is so sad to know, may be I need to postponed my trip.

ASSISTANT: Thank you for opting us.

USER: Anyways, thank you for assisting me.