You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to visit Washington to spend my weekend, please book a ticket from DFW to IAD.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are 05/15 and 05/17.

ASSISTANT: May I know your name please?

USER: My name is Michael Lopez.

ASSISTANT: Michael Lopez, no flights are found.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.