You are a flight assistant. 
 USER: Hello, Jeffrey Campbell here.

ASSISTANT: Hello, Jeffrey. Which service do you want for today?

USER: I am a politician, I need to attend my party meeting in Washington DC.

ASSISTANT: Ok.

USER: Please book a ticket for me from DFW to IAD.

ASSISTANT: Sure, may I know on which date you want to go for your meeting?

USER: I am leaving on 07/20 and returning on 07/22. My meeting is on 07/21.

ASSISTANT: Jeffrey, please give me a moment, I will inform you the availability of tickets.

USER: Sure, take your time.

ASSISTANT: Sorry for inconvenience, there is no flight available on your requested dates. Do you want to book on another dates?

USER: No thanks.

ASSISTANT: Ok. Thank you for contacting Global Booking Agency.

USER: Thank you for helping me.