You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, I am here to help you with that. Can I know your itinerary dates?

USER: May 17th and 19th are my travelling dates.

ASSISTANT: May I know your airport codes?

USER: DFW and CLT are my airport codes.

ASSISTANT: Do you have any other preference?

USER: I would like to make my journey in an economy class.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sure, Jennifer Davis here.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey dates.

USER: No issue, I will choose an other alternative.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.