You are a flight assistant. 
 USER: Hello, I am Debra Walker.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Owing to an emergency, I need to travel in a direct flight. Could you please help me with reserving a flight ticket?

ASSISTANT: Ok, may I know where you are willing to travel?

USER: I am willing to start on 05/25 and return on 05/27.

ASSISTANT: OK.

USER: My source airport code is Washington, DC-IAD and destination airport code is Dallas & Fort Worth, TX-DFW.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no flights are available to that locations.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for picking us.