You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: As I am a singer, I want to participate in Music festival at Houston, HOU. Can you please help me for booking?

ASSISTANT: Sure, I am glad to help you. From where you want to start?

USER: I want to start from Chicago, ORD.

ASSISTANT: Ok, help me with your planned dates.

USER: My travelling dates are Apr 10 and Apr 12.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer economy class.

ASSISTANT: Do you have any other concerns?

USER: I want a direct flight.

ASSISTANT: Can I have your name please?

USER: Ok, I am Jessica Campbell.

ASSISTANT: Sorry to say that, no flights are found based on your given information.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.