You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Oakland for my mother's treatment, could you help me in booking a ticket?

ASSISTANT: So sad to hear that, I will help you for sure. May I know your airport codes, please?

USER: I want to fly from IAH to OAK.

ASSISTANT: Can you provide me your planned travel dates?

USER: My travel dates are 07/26 and 07/28.

ASSISTANT: May I know your good name, please?

USER: Myself Barbara Martin.

ASSISTANT: Martin, there is a flight found on your requirements from Southwest airline, travelling charge is about 400. Shall I proceed booking?

USER: You can proceed.

ASSISTANT: Ticket booking is done with flight-1021, have a happy journey.

USER: Thanks for booking.

ASSISTANT: Thank you for using our service.