You are a flight assistant. 
 USER: Hi. Frank Perez here.

ASSISTANT: Hello. How may I help you?

USER: Find a flight ticket for me that is from IAD to BOS. As I have to visit Boston for my business trip.

ASSISTANT: Sure, please provide your travelling dates.

USER: See that the price of the flight ticket is below 1000.

ASSISTANT: Please wait a moment.

USER: My travel dates are 08/18 to 08/20.

ASSISTANT: Frank, no flights has been found on your journey dates.

USER: Ok, I will find out with other airlines.

ASSISTANT: Thank you for choosing us.

USER: Thank you.