You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be at your service today?

USER: I am Angela Johnson. I am planning to start a new branch at Denver, help me in booking my flight ticket with one halt.

ASSISTANT: Sure, may I know your dates of journey?

USER: I will start my journey on 12/03. I will return on 12/05.

ASSISTANT: Kindly, mention your Source and destination airport codes.

USER: My source is Washington, DC - DCA. My destination is PHL.

ASSISTANT: Ok, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Unfortunately, no flights were found on your requested dates.

USER: Not an issue. Thank you for reaching us.

ASSISTANT: Thank you.