You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to travel from BOS to DFW, help me in booking a flight?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are May 23 to 25.

ASSISTANT: Can you please let me know your name for booking purpose?

USER: I am Emily Smith.

ASSISTANT: Is there any connection preference?

USER: I prefer single connection flight.

ASSISTANT: Do you have any other specifications?

USER: I want to travel in economy class.

ASSISTANT: Emily Smith, there are no flights available in your route with your preferences.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.