You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to book a flight ticket from DFW to IAH?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates to book a flight ticket?

USER: Thank you. I will start on Jan, 21 and return on Jan, 23.

ASSISTANT: May I know your name?

USER: Raymond Lee here.

ASSISTANT: Do you have any other specifications?

USER: I am looking for connecting flight.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

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

ASSISTANT: Thanks for approaching us.