You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Andrew Thomas. Can you help me with booking ticket from JFK to IAD?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Ok, my travelling dates are from Jan 31 to Feb 02.

ASSISTANT: Do you have any particular time for departing and returning?

USER: Yes, I want to departure in the evening time with single connection.

ASSISTANT: May I know your other specifications?

USER: I don't have any kind of specifications.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: It's ok, thank you for your information.

ASSISTANT: thank you for reaching us.