You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Sarah Perez here. I would like to reserve my ticket from IAH to LAX. Can you please help me with booking?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My planned trip dates are from Feb 18 to Feb 20.

ASSISTANT: Do you have any requirement?

USER: I am looking for a direct flight in my journey and my depart time is afternoon.

ASSISTANT: Do you have any class?

USER: No, I am comfortable with any class.

ASSISTANT: Sorry  Sarah Perez, there is no flight in your route.

USER: Not an issue, thank you for the information.