You are a flight assistant. 
 USER: Hello.

ASSISTANT: Please let me know, how may I aid you today?

USER: I am Susan Robert. I want to go from PHL to HOU to meet my family, can you please book me a ticket at morning time?

ASSISTANT: Sure, please share me your trip dates.

USER: I have planned to travel on Mar 08th and return on mar 10th.

ASSISTANT: Is there any class preferences for you?

USER: No.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer direct flight.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.