You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Could you please help me in  booking a ticket from DFW to CLT where I have a meeting to attend.

ASSISTANT: Yes, can you share me your travelling dates?

USER: My itinerary  travel dates are as follows May 04 and May 06.

ASSISTANT: Do you have any preferences?

USER: Yes, I would like to travel by a direct flight.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Not an issue, thank you for your time.

ASSISTANT: Can I know your name?

USER: My name is William Lewis.

ASSISTANT: Thank you for contacting us.