You are a flight assistant. 
 USER: Hi, I am Stephen Baker.

ASSISTANT: Hello, how can I support you Stephen Baker?

USER: Can you help me to book a flight ticket to Dallas, TX-DFW to attend my business meting, can you help me to book a flight ticket from Washington DC-DCA?

ASSISTANT: Sure, let me know your journey dates.

USER: I will depart on 11/19 and I intend to return on 11/21.

ASSISTANT: Ok, no flights were available based on your schedule.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for reaching us.