You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please book a flight ticket from OAK to IAH?

ASSISTANT: Sure, we are mirthful to help you. May I know your travel dates?

USER: My journey dates are July 30 and Aug 01.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Is there any specific time to depart and arrive?

USER: No.

ASSISTANT: Do you have any other requirements?

USER: I prefer a economy class.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: For references, may I know your name please?

USER: I am Larry Parker.

ASSISTANT: Thank you for availing our services.