You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Ronald Martinez here. Please help me out in booking the ticket from PHX to HOU.

ASSISTANT: Sure, May I know the journey dates?

USER: My trip dates will be Jun 1 to Jun 3.

ASSISTANT: Do you have any connection limit?

USER: Flight has to be with single connection.

ASSISTANT: Do you have any preference in return time?

USER: My return time must be in the afternoon.

ASSISTANT: Is there any other requirements?

USER: Economy is my class preference.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your selected dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.