You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need a flight ticket to PHL to attend for a conference. Can you please help me for booking from IAD?

ASSISTANT: Let me know your travel dates.

USER: My travelling dates are on June 22 and 24.

ASSISTANT: Do you have any preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I am fine with any flight.

ASSISTANT: Can I know your name?

USER: Thomas Adams is my name.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, thanks for your help.

ASSISTANT: Thank you.