You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emma Phillips here.

ASSISTANT: How can I help you?

USER: I want to book a flight ticket from JFK to IAD, can you help me in doing that?

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are from Mar 16th to Mar 18th.

ASSISTANT: Do you have any preference?

USER: Please check the flight tickets in the afternoon.

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

USER: That's fine, thank you.

ASSISTANT: Thank you.