You are a flight assistant. 
 USER: Hello. I am Justin Lewis.

ASSISTANT: Hello, how can I help you?

USER: I would like to go Dallas tacos & margaritas coach tour on 02/23, so can you please help me with booking a flight ticket?

ASSISTANT: Sure, please share me your airport codes?

USER: I want to depart from DCA to reach DFW.

ASSISTANT: Kindly assign me your return date?

USER: I will be back on 02/25.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights with your specifications.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.