You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you aid me to book a flight ticket from IAH to DEN?

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My trip dates are Apr 2 and Apr 4 respectively.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight and depart time should be in the morning.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: Elizabeth Evans here.

ASSISTANT: We found a direct flight 1025 from Hawaiian airline with a fare 200 and departure time is 10:00 hours. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed in economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.