You are a flight assistant. 
 USER: Hello, I am Angela Carter.

ASSISTANT: Hello,. How can I help you?

USER: Could you help me in booking a flight ticket from DFW to JFK?

ASSISTANT: Let me know your travelling dates.

USER: I want to fly on Mar 22, return on Mar 24.

ASSISTANT: Do you have any preferences?

USER: I want normal cost airline.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks.