You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I render you?

USER: I need to book a flight ticket from BOS to IAH, can you help me with that?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are 02/17 and 02/19.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: May I know your name for further process?

USER: I am Catherine Thomas.

ASSISTANT: Please wait a minute, let me search a best flight for you.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your preferred dates.

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for choosing us.