You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking my flight from LGA to reach DEN?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: Thank you, my planned journey dates are Feb 20th and Feb 22nd.

ASSISTANT: Do you have any preferences?

USER: I would prefer to travel in the afternoon time while returning.

ASSISTANT: Do you have any other specifications?

USER: I prefer a direct flight for my journey.

ASSISTANT: Give me a moment.

USER: Ok, sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Can I know your name?

USER: My name is Rebecca Perez.

ASSISTANT: Thank you for contacting us.