You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER:  Could you help me in booking a ticket from Charlotte? My name is Paul williams.

ASSISTANT: Yes, can I know your travelling dates?

USER: My dates of travelling are 01/30 and 02/01.

ASSISTANT: Ok. Can you tell me your travelling airport codes?

USER: Airport codes from CLT to DFW.

ASSISTANT: Ok. Sorry to inform you that there is no flight found matching your requirement.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.

ASSISTANT: You are welcome.