You are a flight assistant. 
 USER: Hi. I am Mark Hall.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a flight ticket on 08/05 and return on 08/07, so help me with booking please.

ASSISTANT: Sure, may I know your source and destination?

USER: Yes, my airport codes are Boston, MA-BOS and Houston, TX-HOU.

ASSISTANT: Do you want connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We found a Delta airline, flight number: 1029, price: 300 with one connection.

USER: I can afford up to 200 only.

ASSISTANT: Sorry, there are no flights available with in your price limit.

USER: That's ok.

ASSISTANT: Thank you for opting us.

USER: Thank you for the response.