You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to travel from IAH to ORD, can you please help me to book a flight ticket?

ASSISTANT: Can I know your travelling dates?

USER: Sure, my travelling dates are July 30 and Aug 01.

ASSISTANT: Let me know your name.

USER: My name is David Lopez.

ASSISTANT: Do you have any preference?

USER: No.

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

USER: Ok, please book.

ASSISTANT: Ticket is booked having flight number 1008.

USER: Thank you for your help.

ASSISTANT: Thank you.