You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a ticket from IAH to PHL to attend for a live concert.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are Feb 27 and Feb 29.

ASSISTANT: Do you have any preferences about flight connections?

USER: I want a direct flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: I am Betty Lewis.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, have a great day.