You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to travel from PHL to HOU, help me in booking a flight?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My travelling dates are Dec 22 to 24.

ASSISTANT: Are you looking for any preferred class?

USER: I want direct flight.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Can I have your name to proceed?

USER: I am Amy Hernandez.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.