You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Let me know your travelling dates.

USER: I plan to travel in May from 23rd to 25th.

ASSISTANT: Do you have any preference?

USER: I need a single connecting flight.

ASSISTANT: Let me know your name.

USER: I prefer normal cost airlines. I am David Lewis.

ASSISTANT: Connecting flight can be booked with airline Hawaiian for price 100 having flight number 1004. Shall I book a ticket?

USER: Yes.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.