You are a flight assistant. 
 USER: Hi, I am Raymond Young.

ASSISTANT: Hello. How may I assist you now?

USER: Can you please help me with booking a flight ticket from IAD to OAK?

ASSISTANT: Raymond Young, may I know your desired dates for this journey?

USER: My travel dates are 06/10 and 06/12.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight and depart time is afternoon.

ASSISTANT: Sorry to say, there are no flights available for you.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing our airlines.

USER: Thanks for the help.