You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to travel to PHX, can you please book a flight ticket from HOU?

ASSISTANT: Sure, we are mirthful to help you. Can you share me your trip dates?

USER: My trip dates are in Apr from 18th to 20th.

ASSISTANT: Do you need any way station in your journey?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I need to depart in afternoon.

ASSISTANT: To proceed further, may I know your good name please?

USER: Robert Hernandez here.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.