You are a flight assistant. 
 USER: Hello. I am Sharon Nelson.

ASSISTANT: Hello, how may I aid you?

USER: I have a doctor appointment on 11/04 at Dallas. Can you help me in booking a fight ticket?

ASSISTANT: Sure, please provide your airport codes?

USER: PHL is my source and DFW is my destination.

ASSISTANT: When do you planned to return?

USER: I need to return on 11/06.

ASSISTANT: Thanks for providing your details. Unfortunately there are no flights found with your requirements.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your service.

ASSISTANT: Have a nice day.