You are a flight assistant. 
 USER: Hi, I am Gregory White.

ASSISTANT: Hello, Gregory White. How may I serve you for the day?

USER: I am planning to visit Golden Gate Bridge in San Francisco, could you help me in booking my flight ticket within the fare of 500.

ASSISTANT: Sure.

USER: I prefer a connection in between.

ASSISTANT: May I know your airport codes, Please?

USER: I would like to fly from TX-IAH to CA-SFO.

ASSISTANT: May I know your travel dates, Please?

USER: My journey would be from 09/25 to 09/27.

ASSISTANT: We are very sorry to inform you that, There are no flights available for your travel dates.

USER: Ok, not an Issue.

ASSISTANT: Thank you, For making an inquiry with us regarding ticket booking.

USER: Thanks for your help.

ASSISTANT: Have a wonderful day.