You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Can you help me to book a flight from LGA to HOU?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling dates are May 13 and 15.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I prefer connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I want to depart at evening time. Can you please search for a direct flight for me?

ASSISTANT: Sure. We are sorry to inform you that, there is no flights are available on your mentioned details.

USER: No issues.

ASSISTANT: May I know your name?

USER: My name is Christine Martin.

ASSISTANT: Thank you.

USER: Thank you for your response.