You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Justin Hall.

ASSISTANT: How can I assist you today?

USER: I am planning to travel from DCA to DFW, can you help in booking a flight?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My date of travelling is on 09/13 to 09/15.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no flights found as per your preferable details.

USER: That's ok. Thank you for your help.

ASSISTANT: Welcome, have a great day.