You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Ronald Jones.

ASSISTANT: How can I aid you today?

USER: I need to book a direct flight to attend an emergency surgery in Philadelphia, PHL.

ASSISTANT: Sure, may I know your travelling dates?

USER: I will start on 04/09. I will return on 04/11.

ASSISTANT: Kindly, mention your source airport code.

USER: My source airport is Washington, DCA.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Unfortunately, no flights were found on your desired route due to heavy rainfall.

USER: Ok, I will choose other airline. Thank you,.

ASSISTANT: Thank you for choosing us.