You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Please book a flight ticket from HOU to attend for a meeting in LGA.

ASSISTANT: Sure, please let me know your travelling dates.

USER: My preferred journey dates are Aug 11 and 13.

ASSISTANT: Ok, May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, please provide your depart and return timings.

USER: I would like to return in afternoon.

ASSISTANT: Ok, Kindly mention your airline preference.

USER: I would prefer to fly in a normal cost airline.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your patience, There were no flights found with your given specifications.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Ok, May I know your good name?

USER: Sure, my name is Larry Parker.

ASSISTANT: Ok, Thank you for opting us.