You are a flight assistant. 
 USER: Hello, I am Alexander Smith.

ASSISTANT: Hello, How can I assist you?

USER: I need to fly Dallas, could you please help me in booking my flight ticket from IAH to DFW?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My planned trip dates are 11/23 and 11/25.

ASSISTANT: Please wait a minute.

USER: Ok.

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

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

ASSISTANT: Thank you for opting us.