You are a flight assistant. 
 USER: Hi, my name is Elizabeth Collins.

ASSISTANT: Hello. How may I assist you today?

USER: I need to head from Denver to meet my school friends at Los Angeles. Can you help me book a direct flight?

ASSISTANT: Sure, to proceed further I need to know your travelling dates, can you provide it?

USER: On 03/26, I will depart and return on 03/28.

ASSISTANT: Kindly share your fare limit.

USER: 1000 is my fare limit.

ASSISTANT: Can I know your airport attributes?

USER: They are from DEN to LAX.

ASSISTANT: Thanks for sharing your details.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your essential details.

USER: That's ok, thank you for the information.

ASSISTANT: You're welcome. Have a nice day.