You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to fly from IAD to LGA. Can you book a ticket from that route?

ASSISTANT: Sure, can you share your trip dates?

USER: My planned travel dates are 09/13 and 09/15.

ASSISTANT: Do you have any preferences?

USER: I want a direct flight with my return time should be in morning only.

ASSISTANT: May I know your name?

USER: Sure, Sandra Evans here.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.