You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a flight ticket with economy class. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, please share your planned travel dates to proceed further with the booking.

USER: My travelling dates are May 9 and May 11.

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

USER: My airport codes are HOU and BOS.

ASSISTANT: Which airlines do you prefer to travel?

USER: I prefer normal cost airline.

ASSISTANT: Please share if you have any other preference.

USER: I need a break in between the journey.

ASSISTANT: Sorry, we didn't have any flight which meets all your requirements.

USER: No worries, thank you for the information.

ASSISTANT: May I know your name for documentation purpose?

USER: I am Helen King.

ASSISTANT: Thank you.