You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking a ticket to St. Paul?

ASSISTANT: Sure, please provide your trip dates.

USER: I am travelling on 12/13 and return on 12/15.

ASSISTANT: May I know your source and destination airport codes?

USER: Departure airport is BOS and destination airport is MSP.

ASSISTANT: Please hold on for a while.

USER: Ok.

ASSISTANT: Flight 1025 of Frontier airlines is available for you.

USER: If the connection limit is 1, proceed for booking.

ASSISTANT: May I know your name?

USER: My name is Mary Gonzalez.

ASSISTANT: Sorry Mary, we could not find a flight with 1 connection.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.