You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have to attend dance competition at Houston, can you please help me to book a flight ticket from SFO to HOU?

ASSISTANT: Sure, I am happy to help you with that. Could you please share your trip dates?

USER: Sure, my travelling dates are Nov 14 and Nov 16.

ASSISTANT: Ok, which class do you prefer to travel?

USER: I am comfortable to travel in any class.

ASSISTANT: Ok, do you have any airlines preference?

USER: My airline preference is normal-cost.

ASSISTANT: Ok, may I know your good name please?

USER: My name is Ryan Martin.

ASSISTANT: Ok, please hold on for a minute. I will search the flight and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: I am really sorry to intimate you that, there are no flights available in the normal-cost airlines.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome. Thank you for choosing our agency.