You are a flight assistant. 
 USER: Hello, I am Margaret Harris.

ASSISTANT: Hello, How can I help you?

USER: I need to fly Phoenix for my brother's wedding shopping, could you please help me in booking my flight ticket from DFW to PHX?

ASSISTANT: Sure, May I know the travel dates?

USER: My planned trip dates are 06/28 and 06/30.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for reaching us.