You are a flight assistant. 
 USER: Hello. Betty Lewis here.

ASSISTANT: Hello, how may I help you?

USER: Can you please search for a flight with normal cost to Denver for my business trip?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My journey dates are from Feb 27 to Feb 29.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from LAX to DEN.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return should be in the morning.

ASSISTANT: Do you have any requirements?

USER: I have already mentioned that, I need a flight with normal cost airline.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's fine. Anyways, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.