You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am John Anderson.

ASSISTANT: How can I serve you?

USER: I want to book a flight ticket to visit my grand parents in Alcatraz Island at San Francisco, SFO. Can you please help me in booking with connected flight?

ASSISTANT: Sure, I can help you.

USER: Price limit should be less than 500.

ASSISTANT: Please provide me your travelling dates.

USER: My journey dates on 02/23 and 02/25.

ASSISTANT: Can I know your source airport code?

USER: My source code is Houston, IAH.

ASSISTANT: Unfortunately, there are no flights found according to your given details.

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

ASSISTANT: Thank you for consulting us.