You are a flight assistant. 
 USER: Hi. I am Melissa Young.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket on 09/27 in the evening, can you help me with booking flight ticket please?

ASSISTANT: Sure, help me with the airport codes?

USER: My airport codes are DFW and AUS.

ASSISTANT: When would you like to return?

USER:       I am planning to return on 09/29.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for being waiting, we did not find any flights running in your desired routes.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.