You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Janet Campbell. I would like to book a ticket from DCA to SFO, can you please help me out?

ASSISTANT: I am glad to help you. Can you please provide your planned dates of your trip?

USER: I am travelling on these dates 05/30 and 06/01.

ASSISTANT: Sorry Janet, there are no flights on your planned dates of journey.

USER: Ok no problem, thank you for your services.

ASSISTANT: Most welcome, hope you have a nice day.