You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: This is Ruth Martinez. Can you please book a flight ticket for me from IAD to LGA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travel dates are from May 9th to May 11th.

ASSISTANT: Do you have any class preferences?

USER: I am ok with any class.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I want to return in the evening. I want a single connecting flight.

ASSISTANT: Sorry, there are no flights available at your request.

USER: That's ok, thanks for checking.

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