You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sandra Jackson.

ASSISTANT: How may I help you?

USER: I would like to meet my business client at Oakland, could you please help me in booking a ticket?

ASSISTANT: Sure Sandra, may I know your airport codes please?

USER: My airport codes are from HOU to OAK.

ASSISTANT: For better search, can I know the journey dates please?

USER: My trip dates are from 11/12 to 11/14.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Due to heavy bookings, there are no flights available at this moment.

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

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