You are a flight assistant. 
 USER: Hi. I am Charles Phillips.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a flight ticket from DEN to DFW, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I would like to travel on 06/09 to 06/11.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.