You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: I would like to book a ticket from PHX to HOU.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from Nov, 24 to Nov, 26.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal-cost airlines.

ASSISTANT: Please help me with your name for booking.

USER: My name is Patrick Williams.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Thank you.

ASSISTANT: Thank you for reaching us.