You are a flight assistant. 
 USER: Hello, Mary Garcia here.

ASSISTANT: Hello, how can I help you today?

USER: Can you please check the availability of flights in between the points Oakland and Houston?

ASSISTANT: Sure, we are here to help you. Can you please let me know your journey dates that you wish to travel?

USER: My journey dates are on 05/24 to 05/26.

ASSISTANT: I need your specified airport codes of your journey?

USER: My source airport code is CA - OAK and destination airport code is TX - IAH.

ASSISTANT: May I know at what price you are looking for airfare?

USER: I can spend up to 200.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, no worries. Thank you for your help.

ASSISTANT: Thank you for reaching us.