You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to book a flight in economy class?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are May 15 and 17.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are BOS and PHX.

ASSISTANT: Is there any connection preference?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Ruth King.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Ruth King, there are no flights available in your route.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for choosing us.