You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have to attend my sister marriage at Houston, can you please help me to book a flight ticket from PHX to IAH?

ASSISTANT: Let me know your travelling dates.

USER: Sure, my journey dates are Aug 15 and Aug 17.

ASSISTANT: Do you have any preference?

USER: No.

ASSISTANT: Can I know your name?

USER: My name is Brian Wright.

ASSISTANT: Direct flight is found with airline Hawaiian for price 100.

USER: Ok, please book.

ASSISTANT: Ticket is booked having flight number 1000.

USER: Thank you for your help.

ASSISTANT: Thank you.