You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Benjamin Nelson. Can you please help me in searching a flight from Houston city to Los Angeles?

ASSISTANT:   Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you for accepting my request. My preferred travel dates are Dec 10 and Dec 12.

ASSISTANT: Do you have any class preference?

USER: I am ok with any type of class.

ASSISTANT: Ok, please wait.

USER: Ok, please make sure that the price limit is 200 or less.

ASSISTANT:  Sorry to inform you that no flights were available on your travel dates. Thank you for availing us.