You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: I want to fly on May 20 and return on May 22.

ASSISTANT: May I know your name to reserve your ticket?

USER: Myself Margaret Lewis.

ASSISTANT: Do you need any break between your trip?

USER: I need a single connection.

ASSISTANT: Is there any other requirements?

USER: I would like to depart in the evening time.

ASSISTANT: We regret to inform you that there is no flights going on your way.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.