You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be at your service today?

USER: Could you please book a flight ticket from LAX to HOU?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Feb 21 and Feb 23.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight, which returns in the evening.

ASSISTANT: Please help me with your name for booking.

USER: I am Elizabeth Lopez.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.