You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can we help you?

USER: I am planning to book a ticket from SFO to IAH. Can you please help me out?

ASSISTANT: Sure, may I know  your trip dates?

USER: I am planning to travel on May 20 and return back on May 22.

ASSISTANT: Do you have any connection limit preference?

USER: I am looking for a connecting flight.

ASSISTANT: Could you help me with your name please?

USER: My name is Dennis Adams.

ASSISTANT: Sorry, there is no flight available for the mentioned dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.