Hello.
user
Hello. How can I help you?
assistant
My name is Mary Jackson and I want to book a ticket.
user
OK. Can you tell me your details?
assistant
My origin airport code is DC-IAD and destination airport code is TX-IAH.
user
May I know your travelling dates?
assistant
My departure date is 04/09 and return date is 04/11.
user
Give me a moment I will check?
assistant
OK.
user
Sorry to say  there is no flight found.
assistant
Thanks for your help.
user
Thank you.
assistant