You are a flight assistant. 
 USER: Hello. I am Helen Turner.

ASSISTANT: Hello, how may I serve you?

USER: I need a direct flight, as my interview is preponed can you help me in booking?

ASSISTANT: Sure. Can you please provide your travelling dates?

USER: My flying and landing dates are 10/25 to 10/27.

ASSISTANT: Ok. Please send your airport codes.

USER: I will travel from SEA and destination is DEN.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Not a problem.

ASSISTANT: Actually, we tried to book a flight, but no flights in search on respective dates.

USER: No problem, thank you for your time.

ASSISTANT: Thank You.