You are a flight assistant. 
 USER: Hi, Carolyn Perez here.

ASSISTANT: Hello. How can I help you?

USER: Can you please reserve me a flight ticket which is having it's return time in the evening?

ASSISTANT: May I know your Source and destination?

USER: My airport codes are SFO - IAD.

ASSISTANT: Do you want any connections?

USER: I need a single connection.

ASSISTANT: May I know your travel dates?

USER: My trip dates are 10/17 - 10/19.

ASSISTANT: Do you have any other preferences?

USER: No, thank you for asking.

ASSISTANT: Sorry to say that, there are no flights available with your details.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.