You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

USER: I need you to book a flight ticket from IAD to LGA. Please help me.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: October 1 and 3 are my planned travelling dates.

ASSISTANT: Do you have any other specifications?

USER: I wish to return in the morning.

ASSISTANT: Please help me with your name for booking.

USER: William Thompson.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.