You are a flight assistant. 
 USER: Hello, I am Daniel Taylor.

ASSISTANT: Hello. How can I assist you?

USER: I need to book a direct flight from IAD to LGA as its an emergency to attend a meeting over there. Can you help me in booking?

ASSISTANT: Sure. Can I know your travelling dates?

USER: I would start on 03/15 and come back on 03/17.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your requirements.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.