You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I assist you today?

USER: Could you please avail me a flight ticket from IAH to IAD?

ASSISTANT: Sure, to book a ticket may I know when you are willing to travel?

USER: My trip dates are 01/12 - 01/14.

ASSISTANT: Do you have any other requirements?

USER: I need a single connection.

ASSISTANT: Can you please share me your name?

USER: Melissa Walker here.

ASSISTANT: Unfortunately there is no flights found with your given requirements.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.