You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit the Houston underground tunnel tour which is held at Houston, HOU. Can you avail me to book a flight ticket?

ASSISTANT: Sure, when do you want to travel?

USER: I want to travel on Mar 26 and 28.

ASSISTANT: Ok, do you have any class preference?

USER: No.

ASSISTANT: Ok, Kindly mention your connection limit.

USER: I need a connecting flight.

ASSISTANT: Ok, Is there any other preferences?

USER: No.

ASSISTANT: May I know your source?

USER: I want to start from San Francisco, SFO.

ASSISTANT: Thank you for providing details, we found a connecting flight in 1011 United Airlines with a fare of 100. Can I proceed?

USER: Please proceed with the booking.

ASSISTANT: May I know your name?

USER: Virginia Jones here.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your kind service.

ASSISTANT: Thank you for choosing us.