You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can assist you at this moment?

USER: I am Melissa Thompson. I want to book a flight ticket from DFW to DCA. Can you find a flight ticket for me?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your planned dates of travelling?

USER: Thank you. I want to airborne on 11/22 and recur on 11/24.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.