You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from SFO to IAH?

ASSISTANT: Sure, can I have your name please?

USER: My name is Donna Anderson.

ASSISTANT: Let me know your travel dates?

USER: My journey dates are Mar 4 to Mar 6.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection of flight.

ASSISTANT: Any other preferences?

USER: I prefer to fly in big brand airlines.

ASSISTANT: Sorry, no flights found with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.