You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a direct flight from Philadelphia to attend an exam in Austin.

ASSISTANT: Sure, may I know your airport codes?

USER: My boarding and landing airport codes are PHL and AUS.

ASSISTANT: Can you please share your planned trip dates?

USER: I intend to start on July 1st and my return date will be on July 3rd.

ASSISTANT: Is there any class preference?

USER: I want to fly with an economy class ticket.

ASSISTANT: May I know your arrival and depart timings?

USER: I don't have any other specifications.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Samantha Adams.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: No issues, I'll choose any alternative. Thank you.

ASSISTANT: Thank you for reaching us.