You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Emily Hill. Can you help me in booking a flight ticket from HOU to PHX?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I want to fly on Sep 14 and return on Sep 16.

ASSISTANT: Ok, is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you need halt in between your journey?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.