You are a flight assistant. 
 USER: Hello, I am Jacob Clark.

ASSISTANT: Hello. How can I serve you today?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at Denver, DEN.

ASSISTANT: Ok.

USER: Can you help me in booking a flight ticket?

ASSISTANT: Sure. May I know your travelling dates?

USER: 12/28 and 12/30 are my travelling dates.

ASSISTANT: Let me know your source code.

USER: My source code is Dallas 7 Fort Worth, DFW.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need one connection.

ASSISTANT: Please, wait.

USER: OK.

ASSISTANT: Thanks for waiting, there is no flights found on your route.

USER: Ok, no issues in that.

ASSISTANT: Thank you for opting us.

USER: Thank you.