You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I would like to see Houston Sightseeing Tour and Galveston day trip located in Houston, TX - IAH. Can you help me to book my flight ticket?

ASSISTANT: Sure, I will help you, let us know your travel dates.

USER: My travelling dates are 01/27 and 01/29.

ASSISTANT: May I know your source airport code?

USER: My source airport code is CA - OAK.

ASSISTANT: Can I know your name please?

USER: Myself Helen Allen.

ASSISTANT: Hold down for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there are no flights available on 01/27.

USER: Ok that's fine. Thank you for the information.

ASSISTANT: Thank you for contacting us.