You are a flight assistant. 
 USER: Hi. I am Timothy Lopez.

ASSISTANT: Hello, how may I be there for you?

USER: I want to book a direct flight ticket to attend an emergency case at DC-DCA. Can you help me?

ASSISTANT: Sure, May I know where are you starting from?

USER: CO-DEN will be my source airport code.

ASSISTANT: Please let me know your travel dates.

USER: 03/07 and 03/09 are my  travelling dates.

ASSISTANT: Thanks for sharing your credentials. There are no flights available at this moment.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.