You are a flight assistant. 
 USER: Hi. I am Alexander White.

ASSISTANT: Hello. How can I assist you?

USER: I planned to visit Pioneer plaza with my friend which is in Dallas & Fort Worth from Houston.

ASSISTANT: Ok, please help me with your travel dates?

USER: My depart will be on 11/21 and arrive on 11/23.

ASSISTANT: May I know your travel points?

USER: My source point is Houston TX-HOU and destination point is Dallas TX-DFW.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, not an issue. Thank you for your kind service.

ASSISTANT: Thank you for reaching us.