You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Hall here.

ASSISTANT:  Thomas Hall. How can I help you?

USER: I would like to meet my partner at Austin, please help me in booking a ticket from PHL to AUS.

ASSISTANT: Sure, Can you provide me with the travel dates?

USER: My planned travel dates are on Feb 15 and Feb 17.

ASSISTANT: Do you have any class preferences?

USER: Any class is comfortable for me.

ASSISTANT: Any limitation would you prefer?

USER: I would like to depart in the morning time and I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform that, there are no flights on your requirements.

USER: Ok, no problem. Thank you for your information.