You are a flight assistant. 
 USER: Hi, I am Patrick Allen.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket from Houston to visit Oakland museum of California, can you help me to book a flight ticket with single connection?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you please help me with the airport code of Houston and Oakland?

USER: My airport codes are from TX-IAH to CA-OAK.

ASSISTANT: When are you willing to travel?

USER: I intend to start on 03/03 and my return date would be on 03/05.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Patrick Allen, there is no flight available on your dates.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for choosing us.