You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Daniel Clark.

ASSISTANT: How may I help you?

USER: I need to travel Washington DC, can you please book flight ticket from LGA and IAD?

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My travelling dates are 06/28 and 06/30.

ASSISTANT: Please wait for a minute.

USER: Please take your time.

ASSISTANT: Sorry to say that, there are no flight's available on based on your travelling dates.

USER: That's not an issue, I will choose any other source to travel that place. Thank you for searching the flights.

ASSISTANT: Thank you for reaching us.