You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me to book a connecting flight to San Francisco to attend in my brother's graduate ceremony.

ASSISTANT: Sure, can you please provide your airport locations?

USER: I want to start from Dallas, TX-DFW to reach San Francisco, CA-SFO.

ASSISTANT: Ok, may I know when you are willing to travel?

USER: 06/25 and 06/27 are my planned journey dates.

ASSISTANT: Do you need any halt in between journey?

USER: I prefer one connection.

ASSISTANT: Kindly mention your price limit? Can I have your name to proceed?

USER: I am Larry Carter.

ASSISTANT: Ok, please hold a moment.

USER: Ok.

ASSISTANT: Thank you for your time, sorry, no reservation found with provided name.

USER: Ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for availing us.