You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am willing to travel from LGA to DCA, can you help me?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: Ok, my travel date is on 04/13 and return date is 04/15.

ASSISTANT: Meanwhile, please provide your name.

USER: My name is William Brown.

ASSISTANT: William Brown, there are no flight services available on this route on your provided dates.

USER: That's ok, not a problem. Thank you for the assistance.

ASSISTANT: Thank you for contacting us.