You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want a direct flight.

ASSISTANT: Ok, can I know your travelling dates?

USER: The travel dates are from 06/07 to 06/09.

ASSISTANT: Could you help me with your travelling codes?

USER: I would like to travel from PHL to IAD.

ASSISTANT: Ok, give me a moment.

USER: Ok.

ASSISTANT: Sorry to say that there are no flights found matching your requirement.

USER: That's so sad, thank you for your help.

ASSISTANT: You are welcome. Can I know your name for documentation purpose?

USER: Rebecca Parker here.

ASSISTANT: Thank you for your details.