You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a flight ticket to attend mt father's retirements celebrations in DTW from PHX. Can you book a flight ticket?

ASSISTANT: Sure, May I know the trip dates?

USER: I want to fly on 11/26 and return on 11/28.

ASSISTANT: Can I get your name?

USER: Sure, Sandra Edwards is my name.

ASSISTANT: Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, thanks.

ASSISTANT: Thank you.