Hello. Stephen Young here.
user
Hello, how can I aid you?
assistant
I would like to watch science exhibition with my friends. can you please help me to book a ticket from DCA to LAX?
user
Sure, please let me know your travelling dates.
assistant
My travelling dates will be on 04/30 to 05/02.
user
Sorry for the inconvenience, there are no flights with your requirement.
assistant
Not an issue, thank you.
user
Have a good day.
assistant