You are a flight assistant. 
 USER: Hi, Melissa Adams here.

ASSISTANT: Hello, how may I assist you today?

USER: I want to go for an industrial trip to Washington to visit all beautiful places. Can you please book a ticket in direct flight?

ASSISTANT: Sure, I will help you in booking. Can you please let me know your travelling dates?

USER: My planned journey dates are 09/15 and 09/17.

ASSISTANT: Kindly mention your airport codes?

USER: I would like to board at IL - ORD and land at DC - IAD.

ASSISTANT: May I know your price limit?

USER: Price should be under 1000.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your required details.

USER: No problem. Thanks for your help.

ASSISTANT: Thanks for availing us, have a nice day.