You are a flight assistant. 
 USER: Hi, Emma Mitchell here.

ASSISTANT: Hello, how may I help you?

USER: I want to go on a weekend trip to Houston. Can you help me in booking a ticket from DCA to HOU?

ASSISTANT: Sure, may I know your price limit to search for the flight?

USER: Sure, my price limit is 1000.

ASSISTANT: Ok, could you please provide your travelling dates?

USER: My travelling dates are from 03/17 to 03/19.

ASSISTANT: Sorry to say, no flights were found on your dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for checking.