You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Rachel Hill here. I would like to travel from HOU to OAK to meet my sister, can you help me out to book a flight ticket?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My preferable dates are 08/26 and 08/28.

ASSISTANT: Please give me a moment.

USER: I need a direct flight.

ASSISTANT: Sorry Hill, no flights are available on your route with direct connection.

USER: It's ok, thank you for giving information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.