You are a flight assistant. 
 USER: Hi. I am Dorothy Taylor.

ASSISTANT: Hello, how may I help you today?

USER:  I need your help in booking of a flight ticket from LGA to DCA for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure Taylor, may I know your dates of journey please?

USER: My trip dates are 04/16 to 04/18.

ASSISTANT: Sorry Taylor, there is no flight found as per your travelling details.

USER: No issue, thank you.

ASSISTANT: You are welcome.