You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Dennis Perez. I want to book a direct flight ticket to attend an emergency case at TX-IAH. Can you help me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: 03/30 and 04/01 are my travelling dates.

ASSISTANT: May I know your source point?

USER: MA-BOS will be my source airport code.

ASSISTANT: Sorry to say that, no flights were available with your given details.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.