You are a flight assistant. 
 USER: Hello, Alexander Brown here.

ASSISTANT: Hello, how may I assist you?

USER: I am looking for a direct flight from HOU to SFO, please help me in booking a ticket.

ASSISTANT: May I know your journey dates please, Brown?

USER: My travel dates are 05/11 and 05/13.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: There are no direct flights available at this moment.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.