You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Elizabeth Young here.

ASSISTANT: How can I assist you today?

USER: Can you please reserve me a flight ticket from IAD to LAX?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: Sure, my travel dates are from Jan 04 to Jan 06.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specifications regarding your departure and return time?

USER: I need to return in the morning.

ASSISTANT: Ok, please let me know if you have any other specifications.

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a nice day.