You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Anthony Harris here. Will you find a flight from IAD to OAK?

ASSISTANT: Sure, on which dates you like to travel.

USER: My departure date is 10/21 and return date is 10/23.

ASSISTANT: I am sorry, no flights found on your dates.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.