You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to book a flight ticket from IAD to LGA?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: Ok, please book a ticket for the dates Sept 6th and Sept 8th.

ASSISTANT: Do you require any stopovers in your journey?

USER: Ok, please check for a connecting flight.

ASSISTANT: Would you let us know if you have any other preferences?

USER: My planned return timing is during evening.

ASSISTANT: Please share your name.

USER: My name is Lisa Carter.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, that is not a problem. Thank you for assisting me.

ASSISTANT: Thanks for reaching us.