You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my flight ticket from SEA to IAH?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are Aug 27-29.

ASSISTANT: Thank you, do you have any class preference on your journey?

USER: Yes, I need to fly in business class.

ASSISTANT: Sure, may I know your name for the documentation purpose?

USER: My name is Ashley Lopez.

ASSISTANT: Ok, do you have any another preferences on this trip?

USER: No.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.